diff --git a/MareSynchronos/FileCache/CacheMonitor.cs b/MareSynchronos/FileCache/CacheMonitor.cs
index 7d9321d..f8cb4e3 100644
--- a/MareSynchronos/FileCache/CacheMonitor.cs
+++ b/MareSynchronos/FileCache/CacheMonitor.cs
@@ -96,8 +96,7 @@ public sealed class CacheMonitor : DisposableMediatorSubscriberBase
 
     public void HaltScan(string source)
     {
-        if (!HaltScanLocks.ContainsKey(source)) HaltScanLocks[source] = 0;
-        HaltScanLocks[source]++;
+        HaltScanLocks.AddOrUpdate(source, 1, (k, v) => v + 1);
     }
 
     record WatcherChange(WatcherChangeTypes ChangeType, string? OldPath = null);
@@ -447,10 +446,7 @@ public sealed class CacheMonitor : DisposableMediatorSubscriberBase
 
     public void ResumeScan(string source)
     {
-        if (!HaltScanLocks.ContainsKey(source)) HaltScanLocks[source] = 0;
-
-        HaltScanLocks[source]--;
-        if (HaltScanLocks[source] < 0) HaltScanLocks[source] = 0;
+        HaltScanLocks.AddOrUpdate(source, 0, (k, v) => Math.Max(0, v - 1));
     }
 
     protected override void Dispose(bool disposing)
diff --git a/MareSynchronos/MareConfiguration/Configurations/MareConfig.cs b/MareSynchronos/MareConfiguration/Configurations/MareConfig.cs
index dd2e01e..9a22602 100644
--- a/MareSynchronos/MareConfiguration/Configurations/MareConfig.cs
+++ b/MareSynchronos/MareConfiguration/Configurations/MareConfig.cs
@@ -19,7 +19,8 @@ public class MareConfig : IMareConfiguration
     public DtrEntry.Colors DtrColorsNotConnected { get; set; } = new(Glow: 0x0428FFu);
     public DtrEntry.Colors DtrColorsPairsInRange { get; set; } = new(Glow: 0xFFBA47u);
     public bool UseNameColors { get; set; } = false;
-    public DtrEntry.Colors NameColors { get; set; } = new(Foreground: 0xF5EB67u, Glow: 0x78710Fu);
+    public DtrEntry.Colors NameColors { get; set; } = new(Foreground: 0x67EBF5u, Glow: 0x00303Cu);
+    public DtrEntry.Colors BlockedNameColors { get; set; } = new(Foreground: 0x8AADC7, Glow: 0x000080u);
     public bool EnableRightClickMenus { get; set; } = true;
     public NotificationLocation ErrorNotification { get; set; } = NotificationLocation.Both;
     public string ExportFolder { get; set; } = string.Empty;
diff --git a/MareSynchronos/MareConfiguration/Configurations/PlayerPerformanceConfig.cs b/MareSynchronos/MareConfiguration/Configurations/PlayerPerformanceConfig.cs
new file mode 100644
index 0000000..599910a
--- /dev/null
+++ b/MareSynchronos/MareConfiguration/Configurations/PlayerPerformanceConfig.cs
@@ -0,0 +1,12 @@
+namespace MareSynchronos.MareConfiguration.Configurations;
+
+public class PlayerPerformanceConfig : IMareConfiguration
+{
+    public int Version { get; set; } = 1;
+    public bool AutoPausePlayersExceedingThresholds { get; set; } = false;
+    public bool NotifyAutoPauseDirectPairs { get; set; } = true;
+    public bool NotifyAutoPauseGroupPairs { get; set; } = false;
+    public int VRAMSizeAutoPauseThresholdMiB { get; set; } = 550;
+    public int TrisAutoPauseThresholdThousands { get; set; } = 250;
+    public bool IgnoreDirectPairs { get; set; } = true;
+}
\ No newline at end of file
diff --git a/MareSynchronos/MareConfiguration/Configurations/ServerBlockConfig.cs b/MareSynchronos/MareConfiguration/Configurations/ServerBlockConfig.cs
new file mode 100644
index 0000000..df2086a
--- /dev/null
+++ b/MareSynchronos/MareConfiguration/Configurations/ServerBlockConfig.cs
@@ -0,0 +1,10 @@
+using MareSynchronos.MareConfiguration.Models;
+
+namespace MareSynchronos.MareConfiguration.Configurations;
+
+[Serializable]
+public class ServerBlockConfig : IMareConfiguration
+{
+    public Dictionary<string, ServerBlockStorage> ServerBlocks { get; set; } = new(StringComparer.Ordinal);
+    public int Version { get; set; } = 0;
+}
\ No newline at end of file
diff --git a/MareSynchronos/MareConfiguration/Models/ServerBlockStorage.cs b/MareSynchronos/MareConfiguration/Models/ServerBlockStorage.cs
new file mode 100644
index 0000000..642b9c2
--- /dev/null
+++ b/MareSynchronos/MareConfiguration/Models/ServerBlockStorage.cs
@@ -0,0 +1,8 @@
+namespace MareSynchronos.MareConfiguration.Models;
+
+[Serializable]
+public class ServerBlockStorage
+{
+    public List<string> Whitelist { get; set; } = new();
+    public List<string> Blacklist { get; set; } = new();
+}
\ No newline at end of file
diff --git a/MareSynchronos/MareConfiguration/PlayerPerformanceConfigService.cs b/MareSynchronos/MareConfiguration/PlayerPerformanceConfigService.cs
new file mode 100644
index 0000000..e07eca1
--- /dev/null
+++ b/MareSynchronos/MareConfiguration/PlayerPerformanceConfigService.cs
@@ -0,0 +1,11 @@
+using MareSynchronos.MareConfiguration.Configurations;
+
+namespace MareSynchronos.MareConfiguration;
+
+public class PlayerPerformanceConfigService : ConfigurationServiceBase<PlayerPerformanceConfig>
+{
+    public const string ConfigName = "playerperformance.json";
+    public PlayerPerformanceConfigService(string configDir) : base(configDir) { }
+
+    protected override string ConfigurationName => ConfigName;
+}
\ No newline at end of file
diff --git a/MareSynchronos/MareConfiguration/ServerBlockConfigService.cs b/MareSynchronos/MareConfiguration/ServerBlockConfigService.cs
new file mode 100644
index 0000000..9aac787
--- /dev/null
+++ b/MareSynchronos/MareConfiguration/ServerBlockConfigService.cs
@@ -0,0 +1,14 @@
+using MareSynchronos.MareConfiguration.Configurations;
+
+namespace MareSynchronos.MareConfiguration;
+
+public class ServerBlockConfigService : ConfigurationServiceBase<ServerBlockConfig>
+{
+    public const string ConfigName = "blocks.json";
+
+    public ServerBlockConfigService(string configDir) : base(configDir)
+    {
+    }
+
+    protected override string ConfigurationName => ConfigName;
+}
\ No newline at end of file
diff --git a/MareSynchronos/PlayerData/Factories/PairFactory.cs b/MareSynchronos/PlayerData/Factories/PairFactory.cs
index b69f95d..ad56370 100644
--- a/MareSynchronos/PlayerData/Factories/PairFactory.cs
+++ b/MareSynchronos/PlayerData/Factories/PairFactory.cs
@@ -1,4 +1,5 @@
-using MareSynchronos.API.Dto.Group;
+using MareSynchronos.API.Data;
+using MareSynchronos.API.Dto.Group;
 using MareSynchronos.MareConfiguration;
 using MareSynchronos.PlayerData.Pairs;
 using MareSynchronos.Services.Mediator;
@@ -25,8 +26,8 @@ public class PairFactory
         _serverConfigurationManager = serverConfigurationManager;
     }
 
-    public Pair Create()
+    public Pair Create(UserData userData)
     {
-        return new Pair(_loggerFactory.CreateLogger<Pair>(), _cachedPlayerFactory, _mareMediator, _mareConfig, _serverConfigurationManager);
+        return new Pair(_loggerFactory.CreateLogger<Pair>(), userData, _cachedPlayerFactory, _mareMediator, _mareConfig, _serverConfigurationManager);
     }
 }
\ No newline at end of file
diff --git a/MareSynchronos/PlayerData/Handlers/PairHandler.cs b/MareSynchronos/PlayerData/Handlers/PairHandler.cs
index 1bff501..2b98d8f 100644
--- a/MareSynchronos/PlayerData/Handlers/PairHandler.cs
+++ b/MareSynchronos/PlayerData/Handlers/PairHandler.cs
@@ -102,6 +102,12 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
             _downloadCancellationTokenSource = _downloadCancellationTokenSource?.CancelRecreate();
             _applicationCancellationTokenSource = _applicationCancellationTokenSource?.CancelRecreate();
         });
+        Mediator.Subscribe<RecalculatePerformanceMessage>(this, (msg) =>
+        {
+            if (msg.UID != null && !msg.UID.Equals(Pair.UserData.UID, StringComparison.Ordinal)) return;
+            Logger.LogDebug("Recalculating performance for {uid}", Pair.UserData.UID);
+            pair.ApplyLastReceivedData();
+        });
 
         LastAppliedDataBytes = -1;
     }
@@ -159,6 +165,21 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
 
         SetUploading(isUploading: false);
 
+        if (Pair.IsDownloadBlocked)
+        {
+            var reasons = string.Join(", ", Pair.HoldDownloadReasons);
+            Mediator.Publish(new EventMessage(new Event(PlayerName, Pair.UserData, nameof(PairHandler), EventSeverity.Warning,
+                $"Not applying character data: {reasons}")));
+            Logger.LogDebug("[BASE-{appBase}] Not applying due to hold: {reasons}", applicationBase, reasons);
+            var hasDiffMods = characterData.CheckUpdatedData(applicationBase, _cachedData, Logger,
+                this, forceApplyCustomization, forceApplyMods: false)
+                .Any(p => p.Value.Contains(PlayerChanges.ModManip) || p.Value.Contains(PlayerChanges.ModFiles));
+            _forceApplyMods = hasDiffMods || _forceApplyMods || (PlayerCharacter == IntPtr.Zero && _cachedData == null);
+            _cachedData = characterData;
+            Logger.LogDebug("[BASE-{appBase}] Setting data: {hash}, forceApplyMods: {force}", applicationBase, _cachedData.DataHash.Value, _forceApplyMods);
+            return;
+        }
+
         Logger.LogDebug("[BASE-{appbase}] Applying data for {player}, forceApplyCustomization: {forced}, forceApplyMods: {forceMods}", applicationBase, this, forceApplyCustomization, _forceApplyMods);
         Logger.LogDebug("[BASE-{appbase}] Hash for data is {newHash}, current cache hash is {oldHash}", applicationBase, characterData.DataHash.Value, _cachedData?.DataHash.Value ?? "NODATA");
 
@@ -220,6 +241,8 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
     {
         base.Dispose(disposing);
 
+        if (!disposing) return;
+
         SetUploading(isUploading: false);
         _downloadManager.Dispose();
         var name = PlayerName;
@@ -227,18 +250,52 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
         try
         {
             Guid applicationId = Guid.NewGuid();
-            _applicationCancellationTokenSource?.CancelDispose();
-            _applicationCancellationTokenSource = null;
-            _downloadCancellationTokenSource?.CancelDispose();
-            _downloadCancellationTokenSource = null;
-            _charaHandler?.Dispose();
-            _charaHandler = null;
 
             if (!string.IsNullOrEmpty(name))
             {
                 Mediator.Publish(new EventMessage(new Event(name, Pair.UserData, nameof(PairHandler), EventSeverity.Informational, "Disposing User")));
             }
 
+            if (!_lifetime.ApplicationStopping.IsCancellationRequested)
+                UndoApplicationAsync(applicationId).GetAwaiter().GetResult();
+
+            _applicationCancellationTokenSource?.Dispose();
+            _applicationCancellationTokenSource = null;
+            _downloadCancellationTokenSource?.Dispose();
+            _downloadCancellationTokenSource = null;
+            _charaHandler?.Dispose();
+            _charaHandler = null;
+        }
+        catch (Exception ex)
+        {
+            Logger.LogWarning(ex, "Error on disposal of {name}", name);
+        }
+        finally
+        {
+            PlayerName = null;
+            _cachedData = null;
+            Logger.LogDebug("Disposing {name} complete", name);
+        }
+    }
+
+    public void UndoApplication(Guid applicationId = default)
+    {
+        _ = Task.Run(async () => {
+            await UndoApplicationAsync(applicationId).ConfigureAwait(false);
+        });
+    }
+
+    private async Task UndoApplicationAsync(Guid applicationId = default)
+    {
+        Logger.LogDebug($"Undoing application of {Pair.UserPair}");
+        var name = PlayerName;
+        try
+        {
+            if (applicationId == default)
+                applicationId = Guid.NewGuid();
+            _applicationCancellationTokenSource = _applicationCancellationTokenSource?.CancelRecreate();
+            _downloadCancellationTokenSource = _downloadCancellationTokenSource?.CancelRecreate();
+
             Logger.LogDebug("[{applicationId}] Removing Temp Collection for {name} ({user})", applicationId, name, Pair.UserPair);
             if (_penumbraCollection != Guid.Empty)
             {
@@ -246,15 +303,13 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
                 _penumbraCollection = Guid.Empty;
             }
 
-            if (_lifetime.ApplicationStopping.IsCancellationRequested) return;
-
             if (_dalamudUtil is { IsZoning: false, IsInCutscene: false } && !string.IsNullOrEmpty(name))
             {
                 Logger.LogTrace("[{applicationId}] Restoring state for {name} ({OnlineUser})", applicationId, name, Pair.UserPair);
                 if (!IsVisible)
                 {
                     Logger.LogDebug("[{applicationId}] Restoring Glamourer for {name} ({user})", applicationId, name, Pair.UserPair);
-                    _ipcManager.Glamourer.RevertByNameAsync(Logger, name, applicationId).GetAwaiter().GetResult();
+                    await _ipcManager.Glamourer.RevertByNameAsync(Logger, name, applicationId);
                 }
                 else
                 {
@@ -267,7 +322,7 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
                     {
                         try
                         {
-                            RevertCustomizationDataAsync(item.Key, name, applicationId, cts.Token).GetAwaiter().GetResult();
+                            await RevertCustomizationDataAsync(item.Key, name, applicationId, cts.Token);
                         }
                         catch (InvalidOperationException ex)
                         {
@@ -282,13 +337,7 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
         }
         catch (Exception ex)
         {
-            Logger.LogWarning(ex, "Error on disposal of {name}", name);
-        }
-        finally
-        {
-            PlayerName = null;
-            _cachedData = null;
-            Logger.LogDebug("Disposing {name} complete", name);
+            Logger.LogWarning(ex, "Error on undoing application of {name}", name);
         }
     }
 
@@ -382,16 +431,20 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
         _downloadCancellationTokenSource = _downloadCancellationTokenSource?.CancelRecreate() ?? new CancellationTokenSource();
         var downloadToken = _downloadCancellationTokenSource.Token;
 
-        _ = DownloadAndApplyCharacterAsync(applicationBase, charaData, updatedData, updateModdedPaths, updateManip, downloadToken).ConfigureAwait(false);
+        _ = Task.Run(async () => {
+            await DownloadAndApplyCharacterAsync(applicationBase, charaData, updatedData, updateModdedPaths, updateManip, downloadToken).ConfigureAwait(false);
+        });
     }
 
     private async Task DownloadAndApplyCharacterAsync(Guid applicationBase, CharacterData charaData, Dictionary<ObjectKind, HashSet<PlayerChanges>> updatedData,
         bool updateModdedPaths, bool updateManip, CancellationToken downloadToken)
     {
+        Logger.LogTrace("[BASE-{appBase}] DownloadAndApplyCharacterAsync", applicationBase);
         Dictionary<(string GamePath, string? Hash), string> moddedPaths = [];
 
         if (updateModdedPaths)
         {
+            Logger.LogTrace("[BASE-{appBase}] DownloadAndApplyCharacterAsync > updateModdedPaths", applicationBase);
             int attempts = 0;
             List<FileReplacementData> toDownloadReplacements = TryCalculateModdedDictionary(applicationBase, charaData, out moddedPaths, downloadToken);
 
@@ -406,6 +459,7 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
 
                 if (!_playerPerformanceService.ComputeAndAutoPauseOnVRAMUsageThresholds(this, charaData, toDownloadFiles))
                 {
+                    Pair.HoldApplication("IndividualPerformanceThreshold", maxValue: 1);
                     _downloadManager.CancelDownload();
                     return;
                 }
@@ -427,11 +481,30 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
                     break;
                 }
 
-                await Task.Delay(TimeSpan.FromSeconds(2)).ConfigureAwait(false);
+                await Task.Delay(TimeSpan.FromSeconds(2), downloadToken).ConfigureAwait(false);
             }
 
-            if (!await _playerPerformanceService.CheckBothThresholds(this, charaData).ConfigureAwait(false))
+            bool exceedsThreshold = !await _playerPerformanceService.CheckBothThresholds(this, charaData).ConfigureAwait(false);
+
+            if (exceedsThreshold)
+                Pair.HoldApplication("IndividualPerformanceThreshold", maxValue: 1);
+            else
+                Pair.UnholdApplication("IndividualPerformanceThreshold");
+
+            if (exceedsThreshold)
+            {
+                Logger.LogTrace("[BASE-{appBase}] Not applying due to performance thresholds", applicationBase);
                 return;
+            }
+        }
+
+        if (Pair.IsApplicationBlocked)
+        {
+            var reasons = string.Join(", ", Pair.HoldApplicationReasons);
+            Mediator.Publish(new EventMessage(new Event(PlayerName, Pair.UserData, nameof(PairHandler), EventSeverity.Warning,
+                $"Not applying character data: {reasons}")));
+            Logger.LogTrace("[BASE-{appBase}] Not applying due to hold: {reasons}", applicationBase, reasons);
+            return;
         }
 
         downloadToken.ThrowIfCancellationRequested();
@@ -457,11 +530,20 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
     private async Task ApplyCharacterDataAsync(Guid applicationBase, CharacterData charaData, Dictionary<ObjectKind, HashSet<PlayerChanges>> updatedData, bool updateModdedPaths, bool updateManip,
         Dictionary<(string GamePath, string? Hash), string> moddedPaths, CancellationToken token)
     {
+        ushort objIndex = ushort.MaxValue;
         try
         {
             _applicationId = Guid.NewGuid();
             Logger.LogDebug("[BASE-{applicationId}] Starting application task for {this}: {appId}", applicationBase, this, _applicationId);
 
+            if (_penumbraCollection == Guid.Empty)
+            {
+                if (objIndex == ushort.MaxValue)
+                    objIndex = await _dalamudUtil.RunOnFrameworkThread(() => _charaHandler!.GetGameObject()!.ObjectIndex).ConfigureAwait(false);
+                _penumbraCollection = await _ipcManager.Penumbra.CreateTemporaryCollectionAsync(Logger, Pair.UserData.UID);
+                await _ipcManager.Penumbra.AssignTemporaryCollectionAsync(Logger, _penumbraCollection, objIndex);
+            }
+
             Logger.LogDebug("[{applicationId}] Waiting for initial draw for for {handler}", _applicationId, _charaHandler);
             await _dalamudUtil.WaitWhileCharacterIsDrawing(Logger, _charaHandler!, _applicationId, 30000, token).ConfigureAwait(false);
 
@@ -470,7 +552,8 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
             if (updateModdedPaths)
             {
                 // ensure collection is set
-                var objIndex = await _dalamudUtil.RunOnFrameworkThread(() => _charaHandler!.GetGameObject()!.ObjectIndex).ConfigureAwait(false);
+                if (objIndex == ushort.MaxValue)
+                    objIndex = await _dalamudUtil.RunOnFrameworkThread(() => _charaHandler!.GetGameObject()!.ObjectIndex).ConfigureAwait(false);
                 await _ipcManager.Penumbra.AssignTemporaryCollectionAsync(Logger, _penumbraCollection, objIndex).ConfigureAwait(false);
 
                 await _ipcManager.Penumbra.SetTemporaryModsAsync(Logger, _applicationId, _penumbraCollection,
@@ -577,10 +660,6 @@ public sealed class PairHandler : DisposableMediatorSubscriberBase
             Logger.LogTrace("Reapplying Pet Names data for {this}", this);
             await _ipcManager.PetNames.SetPlayerData(PlayerCharacter, _cachedData.PetNamesData).ConfigureAwait(false);
         });
-
-        if (_penumbraCollection == Guid.Empty)
-            _penumbraCollection = _ipcManager.Penumbra.CreateTemporaryCollectionAsync(Logger, Pair.UserData.UID).GetAwaiter().GetResult();
-        _ipcManager.Penumbra.AssignTemporaryCollectionAsync(Logger, _penumbraCollection, _charaHandler.GetGameObject()!.ObjectIndex).GetAwaiter().GetResult();
     }
 
     private async Task RevertCustomizationDataAsync(ObjectKind objectKind, string name, Guid applicationId, CancellationToken cancelToken)
diff --git a/MareSynchronos/PlayerData/Pairs/Pair.cs b/MareSynchronos/PlayerData/Pairs/Pair.cs
index 8385de9..9f599e2 100644
--- a/MareSynchronos/PlayerData/Pairs/Pair.cs
+++ b/MareSynchronos/PlayerData/Pairs/Pair.cs
@@ -12,28 +12,33 @@ using MareSynchronos.Services.Mediator;
 using MareSynchronos.Services.ServerConfiguration;
 using MareSynchronos.Utils;
 using Microsoft.Extensions.Logging;
+using System.Collections.Concurrent;
 
 namespace MareSynchronos.PlayerData.Pairs;
 
-public class Pair
+public class Pair : DisposableMediatorSubscriberBase
 {
     private readonly PairHandlerFactory _cachedPlayerFactory;
     private readonly SemaphoreSlim _creationSemaphore = new(1);
     private readonly ILogger<Pair> _logger;
-    private readonly MareMediator _mediator;
     private readonly MareConfigService _mareConfig;
     private readonly ServerConfigurationManager _serverConfigurationManager;
     private CancellationTokenSource _applicationCts = new();
     private OnlineUserIdentDto? _onlineUserIdentDto = null;
 
-    public Pair(ILogger<Pair> logger, PairHandlerFactory cachedPlayerFactory,
+    public Pair(ILogger<Pair> logger, UserData userData, PairHandlerFactory cachedPlayerFactory,
         MareMediator mediator, MareConfigService mareConfig, ServerConfigurationManager serverConfigurationManager)
+        : base(logger, mediator)
     {
         _logger = logger;
         _cachedPlayerFactory = cachedPlayerFactory;
-        _mediator = mediator;
         _mareConfig = mareConfig;
         _serverConfigurationManager = serverConfigurationManager;
+
+        UserData = userData;
+
+        Mediator.SubscribeKeyed<HoldPairApplicationMessage>(this, UserData.UID, (msg) => HoldApplication(msg.Source));
+        Mediator.SubscribeKeyed<UnholdPairApplicationMessage>(this, UserData.UID, (msg) => UnholdApplication(msg.Source));
     }
 
     public Dictionary<GroupFullInfoDto, GroupPairFullInfoDto> GroupPair { get; set; } = new(GroupDtoComparer.Instance);
@@ -43,6 +48,16 @@ public class Pair
     public bool IsPaused => UserPair != null && UserPair.OtherPermissions.IsPaired() ? UserPair.OtherPermissions.IsPaused() || UserPair.OwnPermissions.IsPaused()
             : GroupPair.All(p => p.Key.GroupUserPermissions.IsPaused() || p.Value.GroupUserPermissions.IsPaused());
 
+    // Download locks apply earlier in the process than Application locks
+    private ConcurrentDictionary<string, int> HoldDownloadLocks { get; set; } = new(StringComparer.Ordinal);
+    private ConcurrentDictionary<string, int> HoldApplicationLocks { get; set; } = new(StringComparer.Ordinal);
+
+    public bool IsDownloadBlocked => HoldDownloadLocks.Any(f => f.Value > 0);
+    public bool IsApplicationBlocked => HoldApplicationLocks.Any(f => f.Value > 0) || IsDownloadBlocked;
+
+    public IEnumerable<string> HoldDownloadReasons => HoldDownloadLocks.Keys;
+    public IEnumerable<string> HoldApplicationReasons => Enumerable.Concat(HoldDownloadLocks.Keys, HoldApplicationLocks.Keys);
+
     public bool IsVisible => CachedPlayer?.IsVisible ?? false;
     public CharacterData? LastReceivedCharacterData { get; set; }
     public string? PlayerName => GetPlayerName();
@@ -52,7 +67,7 @@ public class Pair
     public long LastAppliedApproximateVRAMBytes { get; set; } = -1;
     public string Ident => _onlineUserIdentDto?.Ident ?? string.Empty;
 
-    public UserData UserData => UserPair?.User ?? GroupPair.First().Value.User;
+    public UserData UserData { get; init; }
 
     public UserPairDto? UserPair { get; set; }
 
@@ -65,30 +80,58 @@ public class Pair
         args.AddMenuItem(new MenuItem()
         {
             Name = "Open Profile",
-            OnClicked = (a) => _mediator.Publish(new ProfileOpenStandaloneMessage(this)),
+            OnClicked = (a) => Mediator.Publish(new ProfileOpenStandaloneMessage(this)),
             PrefixColor = 559,
             PrefixChar = 'L'
         });
-        args.AddMenuItem(new MenuItem()
+        if (!IsApplicationBlocked)
         {
-            Name = "Reapply last data",
-            OnClicked = (a) => ApplyLastReceivedData(forced: true),
-            PrefixColor = 559,
-            PrefixChar = 'L',
-        });
+            args.AddMenuItem(new MenuItem()
+            {
+                Name = "Always Block Modded Appearance",
+                OnClicked = (a) => {
+                    _serverConfigurationManager.AddBlacklistUid(UserData.UID);
+                    HoldApplication("Blacklist", maxValue: 1);
+                },
+                PrefixColor = 559,
+                PrefixChar = 'L',
+            });
+            args.AddMenuItem(new MenuItem()
+            {
+                Name = "Reapply last data",
+                OnClicked = (a) => ApplyLastReceivedData(forced: true),
+                PrefixColor = 559,
+                PrefixChar = 'L',
+            });
+        }
+        else
+        {
+            args.AddMenuItem(new MenuItem()
+            {
+                Name = "Always Allow Modded Appearance",
+                OnClicked = (a) => {
+                    _serverConfigurationManager.AddWhitelistUid(UserData.UID);
+                    UnholdApplication("Blacklist", skipApplication: true);
+                    // FIXME: Manually applying here should not be needed here if everything else was written properly
+                    ApplyLastReceivedData(forced: true);
+                },
+                PrefixColor = 559,
+                PrefixChar = 'L',
+            });
+        }
         if (UserPair != null)
         {
             args.AddMenuItem(new MenuItem()
             {
                 Name = "Change Permissions",
-                OnClicked = (a) => _mediator.Publish(new OpenPermissionWindow(this)),
+                OnClicked = (a) => Mediator.Publish(new OpenPermissionWindow(this)),
                 PrefixColor = 559,
                 PrefixChar = 'L',
             });
             args.AddMenuItem(new MenuItem()
             {
                 Name = "Cycle pause state",
-                OnClicked = (a) => _mediator.Publish(new CyclePauseMessage(UserData)),
+                OnClicked = (a) => Mediator.Publish(new CyclePauseMessage(UserData)),
                 PrefixColor = 559,
                 PrefixChar = 'L',
             });
@@ -130,6 +173,10 @@ public class Pair
     {
         if (CachedPlayer == null) return;
         if (LastReceivedCharacterData == null) return;
+        if (IsDownloadBlocked) return;
+
+        if (_serverConfigurationManager.IsUidBlacklisted(UserData.UID))
+            HoldApplication("Blacklist", maxValue: 1);
 
         CachedPlayer.ApplyCharacterData(Guid.NewGuid(), RemoveNotSyncedFiles(LastReceivedCharacterData.DeepClone())!, forced);
     }
@@ -230,6 +277,44 @@ public class Pair
         CachedPlayer?.SetUploading();
     }
 
+    public void HoldApplication(string source, int maxValue = int.MaxValue)
+    {
+        _logger.LogDebug($"Holding {UserData.UID} for reason: {source}");
+        bool wasHeld = IsApplicationBlocked;
+        HoldApplicationLocks.AddOrUpdate(source, 1, (k, v) => Math.Min(maxValue, v + 1));
+        if (!wasHeld)
+            CachedPlayer?.UndoApplication();
+    }
+
+    public void UnholdApplication(string source, bool skipApplication = false)
+    {
+        _logger.LogDebug($"Un-holding {UserData.UID} for reason: {source}");
+        bool wasHeld = IsApplicationBlocked;
+        HoldApplicationLocks.AddOrUpdate(source, 0, (k, v) => Math.Max(0, v - 1));
+        HoldApplicationLocks.TryRemove(new(source, 0));
+        if (!skipApplication && wasHeld && !IsApplicationBlocked)
+            ApplyLastReceivedData(forced: true);
+    }
+
+    public void HoldDownloads(string source, int maxValue = int.MaxValue)
+    {
+        _logger.LogDebug($"Holding {UserData.UID} for reason: {source}");
+        bool wasHeld = IsApplicationBlocked;
+        HoldDownloadLocks.AddOrUpdate(source, 1, (k, v) => Math.Min(maxValue, v + 1));
+        if (!wasHeld)
+            CachedPlayer?.UndoApplication();
+    }
+
+    public void UnholdDownloads(string source, bool skipApplication = false)
+    {
+        _logger.LogDebug($"Un-holding {UserData.UID} for reason: {source}");
+        bool wasHeld = IsApplicationBlocked;
+        HoldDownloadLocks.AddOrUpdate(source, 0, (k, v) => Math.Max(0, v - 1));
+        HoldDownloadLocks.TryRemove(new(source, 0));
+        if (!skipApplication && wasHeld && !IsApplicationBlocked)
+            ApplyLastReceivedData(forced: true);
+    }
+
     private CharacterData? RemoveNotSyncedFiles(CharacterData? data)
     {
         _logger.LogTrace("Removing not synced files");
diff --git a/MareSynchronos/PlayerData/Pairs/PairManager.cs b/MareSynchronos/PlayerData/Pairs/PairManager.cs
index 3ec2f59..38567ce 100644
--- a/MareSynchronos/PlayerData/Pairs/PairManager.cs
+++ b/MareSynchronos/PlayerData/Pairs/PairManager.cs
@@ -54,7 +54,7 @@ public sealed class PairManager : DisposableMediatorSubscriberBase
     public void AddGroupPair(GroupPairFullInfoDto dto)
     {
         if (!_allClientPairs.ContainsKey(dto.User))
-            _allClientPairs[dto.User] = _pairFactory.Create();
+            _allClientPairs[dto.User] = _pairFactory.Create(dto.User);
 
         var group = _allGroups[dto.Group];
         _allClientPairs[dto.User].GroupPair[group] = dto;
@@ -65,7 +65,7 @@ public sealed class PairManager : DisposableMediatorSubscriberBase
     {
         if (!_allClientPairs.ContainsKey(dto.User))
         {
-            _allClientPairs[dto.User] = _pairFactory.Create();
+            _allClientPairs[dto.User] = _pairFactory.Create(dto.User);
         }
         else
         {
diff --git a/MareSynchronos/Plugin.cs b/MareSynchronos/Plugin.cs
index 229478c..105edb0 100644
--- a/MareSynchronos/Plugin.cs
+++ b/MareSynchronos/Plugin.cs
@@ -124,6 +124,8 @@ public sealed class Plugin : IDalamudPlugin
             collection.AddSingleton((s) => new SyncshellConfigService(pluginInterface.ConfigDirectory.FullName));
             collection.AddSingleton((s) => new TransientConfigService(pluginInterface.ConfigDirectory.FullName));
             collection.AddSingleton((s) => new XivDataStorageService(pluginInterface.ConfigDirectory.FullName));
+            collection.AddSingleton((s) => new PlayerPerformanceConfigService(pluginInterface.ConfigDirectory.FullName));
+            collection.AddSingleton((s) => new ServerBlockConfigService(pluginInterface.ConfigDirectory.FullName));
             collection.AddSingleton((s) => new ConfigurationMigrator(s.GetRequiredService<ILogger<ConfigurationMigrator>>(), s.GetRequiredService<NotesConfigService>()));
             collection.AddSingleton<HubFactory>();
 
@@ -163,7 +165,7 @@ public sealed class Plugin : IDalamudPlugin
                 s.GetRequiredService<MareMediator>(), s.GetRequiredService<ApiController>(), s.GetRequiredService<PairManager>(),
                 s.GetRequiredService<ILogger<GameChatHooks>>(), gameInteropProvider, chatGui,
                 s.GetRequiredService<MareConfigService>(), s.GetRequiredService<ServerConfigurationManager>()));
-            collection.AddScoped((s) => new GuiHookService(s.GetRequiredService<ILogger<GuiHookService>>(), s.GetRequiredService<MareMediator>(),
+            collection.AddScoped((s) => new GuiHookService(s.GetRequiredService<ILogger<GuiHookService>>(), s.GetRequiredService<DalamudUtilService>(), s.GetRequiredService<MareMediator>(),
                 s.GetRequiredService<MareConfigService>(), namePlateGui, s.GetRequiredService<PairManager>()));
 
             collection.AddHostedService(p => p.GetRequiredService<MareMediator>());
@@ -178,7 +180,16 @@ public sealed class Plugin : IDalamudPlugin
         })
         .Build();
 
-        _ = _host.StartAsync();
+        Task.Run(async () => {
+            try
+            {
+                await _host.StartAsync();
+            }
+            catch (Exception e)
+            {
+                pluginLog.Error(e, "HostBuilder startup exception");
+            }
+        });
     }
 
     public void Dispose()
diff --git a/MareSynchronos/Services/GuiHookService.cs b/MareSynchronos/Services/GuiHookService.cs
index 5ec90cc..1478ab7 100644
--- a/MareSynchronos/Services/GuiHookService.cs
+++ b/MareSynchronos/Services/GuiHookService.cs
@@ -14,17 +14,19 @@ namespace MareSynchronos.Services;
 public class GuiHookService : DisposableMediatorSubscriberBase
 {
     private readonly ILogger<GuiHookService> _logger;
+    private readonly DalamudUtilService _dalamudUtil;
     private readonly MareConfigService _configService;
     private readonly INamePlateGui _namePlateGui;
     private readonly PairManager _pairManager;
 
     private bool _isModified = false;
 
-    public GuiHookService(ILogger<GuiHookService> logger, MareMediator mediator, MareConfigService configService,
+    public GuiHookService(ILogger<GuiHookService> logger, DalamudUtilService dalamudUtil, MareMediator mediator, MareConfigService configService,
         INamePlateGui namePlateGui, PairManager pairManager)
         : base(logger, mediator)
     {
         _logger = logger;
+        _dalamudUtil = dalamudUtil;
         _configService = configService;
         _namePlateGui = namePlateGui;
         _pairManager = pairManager;
@@ -32,26 +34,32 @@ public class GuiHookService : DisposableMediatorSubscriberBase
         _namePlateGui.OnNamePlateUpdate += OnNamePlateUpdate;
         _namePlateGui.RequestRedraw();
 
-        Mediator.Subscribe<PairHandlerVisibleMessage>(this, (_) => _namePlateGui.RequestRedraw());
+        Mediator.Subscribe<PairHandlerVisibleMessage>(this, (_) => RequestRedraw());
+        Mediator.Subscribe<NameplateRedrawMessage>(this, (_) => RequestRedraw());
     }
 
-    public void RequestRedraw()
+    public void RequestRedraw(bool force = false)
     {
         if (!_configService.Current.UseNameColors)
         {
-            if (!_isModified)
+            if (!_isModified && !force)
                 return;
             _isModified = false;
         }
 
-        _namePlateGui.RequestRedraw();
+        Task.Run(async () => {
+            await _dalamudUtil.RunOnFrameworkThread(() => _namePlateGui.RequestRedraw());
+        });
     }
 
     protected override void Dispose(bool disposing)
     {
         base.Dispose(disposing);
         _namePlateGui.OnNamePlateUpdate -= OnNamePlateUpdate;
-        _namePlateGui.RequestRedraw();
+
+        Task.Run(async () => {
+            await _dalamudUtil.RunOnFrameworkThread(() => _namePlateGui.RequestRedraw());
+        });
     }
 
     private void OnNamePlateUpdate(INamePlateUpdateContext context, IReadOnlyList<INamePlateUpdateHandler> handlers)
@@ -59,13 +67,17 @@ public class GuiHookService : DisposableMediatorSubscriberBase
         if (!_configService.Current.UseNameColors)
             return;
 
-        var visibleUsersIds = _pairManager.GetOnlineUserPairs().Where(u => u.IsVisible && u.PlayerCharacterId != uint.MaxValue).Select(u => (ulong)u.PlayerCharacterId).ToHashSet();
-        var colors = _configService.Current.NameColors;
+        var visibleUsers = _pairManager.GetOnlineUserPairs().Where(u => u.IsVisible && u.PlayerCharacterId != uint.MaxValue);
+        var visibleUsersIds = visibleUsers.Select(u => (ulong)u.PlayerCharacterId).ToHashSet();
+
+        var visibleUsersDict = visibleUsers.ToDictionary(u => (ulong)u.PlayerCharacterId);
 
         foreach (var handler in handlers)
         {
             if (visibleUsersIds.Contains(handler.GameObjectId))
             {
+                var pair = visibleUsersDict[handler.GameObjectId];
+                var colors = !pair.IsApplicationBlocked ? _configService.Current.NameColors : _configService.Current.BlockedNameColors;
                 handler.NameParts.TextWrap = (
                     BuildColorStartSeString(colors),
                     BuildColorEndSeString(colors)
diff --git a/MareSynchronos/Services/Mediator/Messages.cs b/MareSynchronos/Services/Mediator/Messages.cs
index f913eb1..91d758f 100644
--- a/MareSynchronos/Services/Mediator/Messages.cs
+++ b/MareSynchronos/Services/Mediator/Messages.cs
@@ -88,5 +88,11 @@ public record PenumbraDirectoryChangedMessage(string? ModDirectory) : MessageBas
 public record PenumbraRedrawCharacterMessage(ICharacter Character) : SameThreadMessage;
 public record UserChatMsgMessage(SignedChatMessage ChatMsg) : MessageBase;
 public record GroupChatMsgMessage(GroupDto GroupInfo, SignedChatMessage ChatMsg) : MessageBase;
+public record RecalculatePerformanceMessage(string? UID) : MessageBase;
+public record NameplateRedrawMessage : MessageBase;
+public record HoldPairApplicationMessage(string UID, string Source) : KeyedMessage(UID);
+public record UnholdPairApplicationMessage(string UID, string Source) : KeyedMessage(UID);
+public record HoldPairDownloadsMessage(string UID, string Source) : KeyedMessage(UID);
+public record UnholdPairDownloadsMessage(string UID, string Source) : KeyedMessage(UID);
 #pragma warning restore S2094
 #pragma warning restore MA0048 // File name must match type name
\ No newline at end of file
diff --git a/MareSynchronos/Services/PlayerPerformanceService.cs b/MareSynchronos/Services/PlayerPerformanceService.cs
index 3c0fd34..b454ee6 100644
--- a/MareSynchronos/Services/PlayerPerformanceService.cs
+++ b/MareSynchronos/Services/PlayerPerformanceService.cs
@@ -1,25 +1,40 @@
 using MareSynchronos.API.Data;
 using MareSynchronos.FileCache;
+using MareSynchronos.MareConfiguration;
 using MareSynchronos.PlayerData.Handlers;
+using MareSynchronos.Services.Events;
 using MareSynchronos.Services.Mediator;
+using MareSynchronos.Services.ServerConfiguration;
+using MareSynchronos.UI;
 using MareSynchronos.WebAPI.Files.Models;
 using Microsoft.Extensions.Logging;
 
 namespace MareSynchronos.Services;
 
-public class PlayerPerformanceService
+public class PlayerPerformanceService : DisposableMediatorSubscriberBase
 {
+    // Limits that will still be enforced when no limits are enabled
+    public const int MaxVRAMUsageThreshold = 2000; // 2GB
+    public const int MaxTriUsageThreshold = 2000000; // 2 million triangles
+
     private readonly FileCacheManager _fileCacheManager;
     private readonly XivDataAnalyzer _xivDataAnalyzer;
     private readonly ILogger<PlayerPerformanceService> _logger;
     private readonly MareMediator _mediator;
+    private readonly ServerConfigurationManager _serverConfigurationManager;
+    private readonly PlayerPerformanceConfigService _playerPerformanceConfigService;
+    private readonly Dictionary<string, bool> _warnedForPlayers = new(StringComparer.Ordinal);
 
     public PlayerPerformanceService(ILogger<PlayerPerformanceService> logger, MareMediator mediator,
-        FileCacheManager fileCacheManager,
+        ServerConfigurationManager serverConfigurationManager,
+        PlayerPerformanceConfigService playerPerformanceConfigService, FileCacheManager fileCacheManager,
         XivDataAnalyzer xivDataAnalyzer)
+        : base(logger, mediator)
     {
         _logger = logger;
         _mediator = mediator;
+        _serverConfigurationManager = serverConfigurationManager;
+        _playerPerformanceConfigService = playerPerformanceConfigService;
         _fileCacheManager = fileCacheManager;
         _xivDataAnalyzer = xivDataAnalyzer;
     }
@@ -36,6 +51,7 @@ public class PlayerPerformanceService
 
     public async Task<bool> CheckTriangleUsageThresholds(PairHandler pairHandler, CharacterData charaData)
     {
+        var config = _playerPerformanceConfigService.Current;
         var pair = pairHandler.Pair;
 
         long triUsage = 0;
@@ -58,13 +74,42 @@ public class PlayerPerformanceService
 
         pair.LastAppliedDataTris = triUsage;
 
-        _logger.LogDebug("Calculated VRAM usage for {p}", pairHandler);
+        _logger.LogDebug("Calculated Triangle usage for {p}", pairHandler);
+
+        long triUsageThreshold = config.TrisAutoPauseThresholdThousands * 1000;
+        bool isDirect = pair.UserPair != null;
+        bool autoPause = config.AutoPausePlayersExceedingThresholds;
+        bool notify = isDirect ? config.NotifyAutoPauseDirectPairs : config.NotifyAutoPauseGroupPairs;
+
+        if (autoPause && isDirect && config.IgnoreDirectPairs)
+            autoPause = false;
+
+        if (!autoPause || _serverConfigurationManager.IsUidWhitelisted(pair.UserData.UID))
+            triUsageThreshold = MaxTriUsageThreshold;
+
+        if (triUsage > triUsageThreshold)
+        {
+            if (notify && !pair.IsApplicationBlocked)
+            {
+                _mediator.Publish(new NotificationMessage($"{pair.PlayerName} ({pair.UserData.AliasOrUID}) automatically blocked",
+                    $"Player {pair.PlayerName} ({pair.UserData.AliasOrUID}) exceeded your configured triangle auto block threshold (" +
+                    $"{triUsage}/{triUsageThreshold} triangles)" +
+                    $" and has been automatically blocked.",
+                    MareConfiguration.Models.NotificationType.Warning));
+            }
+
+            _mediator.Publish(new EventMessage(new Event(pair.PlayerName, pair.UserData, nameof(PlayerPerformanceService), EventSeverity.Warning,
+                $"Exceeds triangle threshold: ({triUsage}/{triUsageThreshold} triangles)")));
+
+            return false;
+        }
 
         return true;
     }
 
     public bool ComputeAndAutoPauseOnVRAMUsageThresholds(PairHandler pairHandler, CharacterData charaData, List<DownloadFileTransfer> toDownloadFiles)
     {
+        var config = _playerPerformanceConfigService.Current;
         var pair = pairHandler.Pair;
 
         long vramUsage = 0;
@@ -110,6 +155,34 @@ public class PlayerPerformanceService
 
         _logger.LogDebug("Calculated VRAM usage for {p}", pairHandler);
 
+        long vramUsageThreshold = config.VRAMSizeAutoPauseThresholdMiB;
+        bool isDirect = pair.UserPair != null;
+        bool autoPause = config.AutoPausePlayersExceedingThresholds;
+        bool notify = isDirect ? config.NotifyAutoPauseDirectPairs : config.NotifyAutoPauseGroupPairs;
+
+        if (autoPause && isDirect && config.IgnoreDirectPairs)
+            autoPause = false;
+
+        if (!autoPause || _serverConfigurationManager.IsUidWhitelisted(pair.UserData.UID))
+            vramUsageThreshold = MaxVRAMUsageThreshold;
+
+        if (vramUsage > vramUsageThreshold * 1024 * 1024)
+        {
+            if (notify && !pair.IsApplicationBlocked)
+            {
+                _mediator.Publish(new NotificationMessage($"{pair.PlayerName} ({pair.UserData.AliasOrUID}) automatically blocked",
+                    $"Player {pair.PlayerName} ({pair.UserData.AliasOrUID}) exceeded your configured VRAM auto block threshold (" +
+                    $"{UiSharedService.ByteToString(vramUsage, addSuffix: true)}/{vramUsageThreshold}MiB)" +
+                    $" and has been automatically blocked.",
+                    MareConfiguration.Models.NotificationType.Warning));
+            }
+
+            _mediator.Publish(new EventMessage(new Event(pair.PlayerName, pair.UserData, nameof(PlayerPerformanceService), EventSeverity.Warning,
+                $"Exceeds VRAM threshold: ({UiSharedService.ByteToString(vramUsage, addSuffix: true)}/{vramUsageThreshold} MiB)")));
+
+            return false;
+        }
+
         return true;
     }
 }
\ No newline at end of file
diff --git a/MareSynchronos/Services/ServerConfiguration/ServerConfigurationManager.cs b/MareSynchronos/Services/ServerConfiguration/ServerConfigurationManager.cs
index fa11f50..1ca62d6 100644
--- a/MareSynchronos/Services/ServerConfiguration/ServerConfigurationManager.cs
+++ b/MareSynchronos/Services/ServerConfiguration/ServerConfigurationManager.cs
@@ -15,11 +15,16 @@ public class ServerConfigurationManager
     private readonly ILogger<ServerConfigurationManager> _logger;
     private readonly MareMediator _mareMediator;
     private readonly NotesConfigService _notesConfig;
+    private readonly ServerBlockConfigService _blockConfig;
     private readonly ServerTagConfigService _serverTagConfig;
     private readonly SyncshellConfigService _syncshellConfig;
 
+    private HashSet<string>? CachedWhitelistedUIDs = null;
+    private HashSet<string>? CachedBlacklistedUIDs = null;
+
     public ServerConfigurationManager(ILogger<ServerConfigurationManager> logger, ServerConfigService configService,
         ServerTagConfigService serverTagConfig, SyncshellConfigService syncshellConfig, NotesConfigService notesConfig,
+        ServerBlockConfigService blockConfig,
         DalamudUtilService dalamudUtil, MareMediator mareMediator)
     {
         _logger = logger;
@@ -27,6 +32,7 @@ public class ServerConfigurationManager
         _serverTagConfig = serverTagConfig;
         _syncshellConfig = syncshellConfig;
         _notesConfig = notesConfig;
+        _blockConfig = blockConfig;
         _dalamudUtil = dalamudUtil;
         _mareMediator = mareMediator;
         EnsureMainExists();
@@ -35,11 +41,16 @@ public class ServerConfigurationManager
     public string CurrentApiUrl => CurrentServer.ServerUri;
     public ServerStorage CurrentServer => _configService.Current.ServerStorage[CurrentServerIndex];
 
+    public IReadOnlyList<string> Whitelist => CurrentBlockStorage().Whitelist;
+    public IReadOnlyList<string> Blacklist => CurrentBlockStorage().Blacklist;
+
     public int CurrentServerIndex
     {
         set
         {
             _configService.Current.CurrentServer = value;
+            CachedWhitelistedUIDs = null;
+            CachedBlacklistedUIDs = null;
             _configService.Save();
         }
         get
@@ -403,6 +414,54 @@ public class ServerConfigurationManager
         _syncshellConfig.Save();
     }
 
+    internal bool IsUidWhitelisted(string uid)
+    {
+        CachedWhitelistedUIDs ??= [.. CurrentBlockStorage().Whitelist];
+        return CachedWhitelistedUIDs.Contains(uid);
+    }
+
+    internal bool IsUidBlacklisted(string uid)
+    {
+        CachedBlacklistedUIDs ??= [.. CurrentBlockStorage().Blacklist];
+        return CachedBlacklistedUIDs.Contains(uid);
+    }
+
+    internal void AddWhitelistUid(string uid)
+    {
+        if (IsUidWhitelisted(uid))
+            return;
+        if (CurrentBlockStorage().Blacklist.RemoveAll(u => u == uid) > 0)
+            CachedBlacklistedUIDs = null;
+        CurrentBlockStorage().Whitelist.Add(uid);
+        CachedWhitelistedUIDs = null;
+        _blockConfig.Save();
+    }
+
+    internal void AddBlacklistUid(string uid)
+    {
+        if (IsUidBlacklisted(uid))
+            return;
+        if (CurrentBlockStorage().Whitelist.RemoveAll(u => u == uid) > 0)
+            CachedWhitelistedUIDs = null;
+        CurrentBlockStorage().Blacklist.Add(uid);
+        CachedBlacklistedUIDs = null;
+        _blockConfig.Save();
+    }
+
+    internal void RemoveWhitelistUid(string uid)
+    {
+        if (CurrentBlockStorage().Whitelist.RemoveAll(u => u == uid) > 0)
+            CachedWhitelistedUIDs = null;
+        _blockConfig.Save();
+    }
+
+    internal void RemoveBlacklistUid(string uid)
+    {
+        if (CurrentBlockStorage().Blacklist.RemoveAll(u => u == uid) > 0)
+            CachedBlacklistedUIDs = null;
+        _blockConfig.Save();
+    }
+
     private ServerNotesStorage CurrentNotesStorage()
     {
         TryCreateCurrentNotesStorage();
@@ -421,6 +480,12 @@ public class ServerConfigurationManager
         return _syncshellConfig.Current.ServerShellStorage[CurrentApiUrl];
     }
 
+    private ServerBlockStorage CurrentBlockStorage()
+    {
+        TryCreateCurrentBlockStorage();
+        return _blockConfig.Current.ServerBlocks[CurrentApiUrl];
+    }
+
     private void EnsureMainExists()
     {
         bool lopExists = false;
@@ -478,4 +543,12 @@ public class ServerConfigurationManager
             _syncshellConfig.Current.ServerShellStorage[CurrentApiUrl] = new();
         }
     }
+
+    private void TryCreateCurrentBlockStorage()
+    {
+        if (!_blockConfig.Current.ServerBlocks.ContainsKey(CurrentApiUrl))
+        {
+            _blockConfig.Current.ServerBlocks[CurrentApiUrl] = new();
+        }
+    }
 }
\ No newline at end of file
diff --git a/MareSynchronos/UI/SettingsUi.cs b/MareSynchronos/UI/SettingsUi.cs
index f4ba59c..80e59a6 100644
--- a/MareSynchronos/UI/SettingsUi.cs
+++ b/MareSynchronos/UI/SettingsUi.cs
@@ -52,6 +52,8 @@ public class SettingsUi : WindowMediatorSubscriberBase
     private readonly GuiHookService _guiHookService;
     private readonly PerformanceCollectorService _performanceCollector;
     private readonly ServerConfigurationManager _serverConfigurationManager;
+    private readonly PlayerPerformanceConfigService _playerPerformanceConfigService;
+    private readonly PlayerPerformanceService _playerPerformanceService;
     private readonly UiSharedService _uiShared;
     private bool _deleteAccountPopupModalShown = false;
     private bool _deleteFilesPopupModalShown = false;
@@ -76,6 +78,7 @@ public class SettingsUi : WindowMediatorSubscriberBase
         UiSharedService uiShared, MareConfigService configService,
         MareCharaFileManager mareCharaFileManager, PairManager pairManager, ChatService chatService, GuiHookService guiHookService,
         ServerConfigurationManager serverConfigurationManager,
+        PlayerPerformanceConfigService playerPerformanceConfigService, PlayerPerformanceService playerPerformanceService,
         MareMediator mediator, PerformanceCollectorService performanceCollector,
         FileUploadManager fileTransferManager,
         FileTransferOrchestrator fileTransferOrchestrator,
@@ -90,6 +93,8 @@ public class SettingsUi : WindowMediatorSubscriberBase
         _chatService = chatService;
         _guiHookService = guiHookService;
         _serverConfigurationManager = serverConfigurationManager;
+        _playerPerformanceConfigService = playerPerformanceConfigService;
+        _playerPerformanceService = playerPerformanceService;
         _performanceCollector = performanceCollector;
         _fileTransferManager = fileTransferManager;
         _fileTransferOrchestrator = fileTransferOrchestrator;
@@ -673,6 +678,18 @@ public class SettingsUi : WindowMediatorSubscriberBase
             _configService.Current.LogEvents = logEvents;
             _configService.Save();
         }
+
+        ImGui.Separator();
+        _uiShared.BigText("Active Character Blocks");
+        foreach (var pair in _pairManager.GetOnlineUserPairs())
+        {
+            if (pair.IsApplicationBlocked)
+            {
+                ImGui.TextUnformatted(pair.PlayerName);
+                ImGui.SameLine();
+                ImGui.TextUnformatted(string.Join(", ", pair.HoldApplicationReasons));
+            }
+        }
     }
 
     private void DrawFileStorageSettings()
@@ -1055,6 +1072,7 @@ public class SettingsUi : WindowMediatorSubscriberBase
 
         var useNameColors = _configService.Current.UseNameColors;
         var nameColors = _configService.Current.NameColors;
+        var autoPausedNameColors = _configService.Current.BlockedNameColors;
         if (ImGui.Checkbox("Color nameplates of paired players", ref useNameColors))
         {
             _configService.Current.UseNameColors = useNameColors;
@@ -1071,6 +1089,15 @@ public class SettingsUi : WindowMediatorSubscriberBase
                 _configService.Save();
                 _guiHookService.RequestRedraw();
             }
+
+            ImGui.SameLine();
+
+            if (InputDtrColors("Blocked Character Color", ref autoPausedNameColors))
+            {
+                _configService.Current.BlockedNameColors = autoPausedNameColors;
+                _configService.Save();
+                _guiHookService.RequestRedraw();
+            }
         }
 
         if (ImGui.Checkbox("Show separate Visible group", ref showVisibleSeparate))
@@ -1205,6 +1232,215 @@ public class SettingsUi : WindowMediatorSubscriberBase
         }
     }
 
+    private bool _perfUnapplied = false;
+
+    private void DrawPerformance()
+    {
+        _uiShared.BigText("Performance Settings");
+        UiSharedService.TextWrapped("The configuration options here are to give you more informed warnings and automation when it comes to other performance-intensive synced players.");
+        ImGui.Separator();
+        bool recalculatePerformance = false;
+        string? recalculatePerformanceUID = null;
+
+        _uiShared.BigText("Individual Limits");
+        bool autoPause = _playerPerformanceConfigService.Current.AutoPausePlayersExceedingThresholds;
+        if (ImGui.Checkbox("Automatically block players exceeding thresholds", ref autoPause))
+        {
+            _playerPerformanceConfigService.Current.AutoPausePlayersExceedingThresholds = autoPause;
+            _playerPerformanceConfigService.Save();
+            recalculatePerformance = true;
+        }
+        _uiShared.DrawHelpText("When enabled, it will automatically block the modded appearance of all players that exceed the thresholds defined below." + Environment.NewLine
+            + "Will print a warning in chat when a player is blocked automatically.");
+        using (ImRaii.Disabled(!autoPause))
+        {
+            using var indent = ImRaii.PushIndent();
+            var notifyDirectPairs = _playerPerformanceConfigService.Current.NotifyAutoPauseDirectPairs;
+            var notifyGroupPairs = _playerPerformanceConfigService.Current.NotifyAutoPauseGroupPairs;
+            if (ImGui.Checkbox("Display auto-block warnings for individual pairs", ref notifyDirectPairs))
+            {
+                _playerPerformanceConfigService.Current.NotifyAutoPauseDirectPairs = notifyDirectPairs;
+                _playerPerformanceConfigService.Save();
+            }
+            if (ImGui.Checkbox("Display auto-block warnings for syncshell pairs", ref notifyGroupPairs))
+            {
+                _playerPerformanceConfigService.Current.NotifyAutoPauseGroupPairs = notifyGroupPairs;
+                _playerPerformanceConfigService.Save();
+            }
+            var vramAuto = _playerPerformanceConfigService.Current.VRAMSizeAutoPauseThresholdMiB;
+            var trisAuto = _playerPerformanceConfigService.Current.TrisAutoPauseThresholdThousands;
+            ImGui.SetNextItemWidth(100 * ImGuiHelpers.GlobalScale);
+            if (ImGui.InputInt("Auto Block VRAM threshold", ref vramAuto))
+            {
+                _playerPerformanceConfigService.Current.VRAMSizeAutoPauseThresholdMiB = vramAuto;
+                _playerPerformanceConfigService.Save();
+                _perfUnapplied = true;
+            }
+            ImGui.SameLine();
+            ImGui.Text("(MiB)");
+            _uiShared.DrawHelpText("When a loading in player and their VRAM usage exceeds this amount, automatically blocks the synced player." + UiSharedService.TooltipSeparator
+                + "Default: 550 MiB");
+            ImGui.SetNextItemWidth(100 * ImGuiHelpers.GlobalScale);
+            if (ImGui.InputInt("Auto Block Triangle threshold", ref trisAuto))
+            {
+                _playerPerformanceConfigService.Current.TrisAutoPauseThresholdThousands = trisAuto;
+                _playerPerformanceConfigService.Save();
+                _perfUnapplied = true;
+            }
+            ImGui.SameLine();
+            ImGui.Text("(thousand triangles)");
+            _uiShared.DrawHelpText("When a loading in player and their triangle count exceeds this amount, automatically blocks the synced player." + UiSharedService.TooltipSeparator
+                + "Default: 250 thousand");
+            using (ImRaii.Disabled(!_perfUnapplied))
+            {
+                if (ImGui.Button("Apply Changes Now"))
+                {
+                    recalculatePerformance = true;
+                    _perfUnapplied = false;
+                }
+            }
+        }
+
+#region Whitelist
+        ImGui.Separator();
+        _uiShared.BigText("Whitelisted UIDs");
+        bool ignoreDirectPairs = _playerPerformanceConfigService.Current.IgnoreDirectPairs;
+        if (ImGui.Checkbox("Whitelist all individual pairs", ref ignoreDirectPairs))
+        {
+            _playerPerformanceConfigService.Current.IgnoreDirectPairs = ignoreDirectPairs;
+            _playerPerformanceConfigService.Save();
+            recalculatePerformance = true;
+        }
+        _uiShared.DrawHelpText("Individual pairs will never be affected by auto blocks.");
+        ImGui.Dummy(new Vector2(5));
+        UiSharedService.TextWrapped("The entries in the list below will be not have auto block thresholds enforced.");
+        ImGui.SetNextItemWidth(200 * ImGuiHelpers.GlobalScale);
+        var whitelistPos = ImGui.GetCursorPos();
+        ImGui.SetCursorPosX(240 * ImGuiHelpers.GlobalScale);
+        ImGui.InputText("##whitelistuid", ref _uidToAddForIgnore, 20);
+        using (ImRaii.Disabled(string.IsNullOrEmpty(_uidToAddForIgnore)))
+        {
+            ImGui.SetCursorPosX(240 * ImGuiHelpers.GlobalScale);
+            if (_uiShared.IconTextButton(FontAwesomeIcon.Plus, "Add UID to whitelist"))
+            {
+                if (!_serverConfigurationManager.IsUidWhitelisted(_uidToAddForIgnore))
+                {
+                    _serverConfigurationManager.AddWhitelistUid(_uidToAddForIgnore);
+                    recalculatePerformance = true;
+                    recalculatePerformanceUID = _uidToAddForIgnore;
+                }
+                _uidToAddForIgnore = string.Empty;
+            }
+        }
+        ImGui.SetCursorPosX(240 * ImGuiHelpers.GlobalScale);
+        _uiShared.DrawHelpText("Hint: UIDs are case sensitive.\nVanity IDs are also acceptable.");
+        ImGui.Dummy(new Vector2(10));
+        var playerList = _serverConfigurationManager.Whitelist;
+        if (_selectedEntry > playerList.Count - 1)
+            _selectedEntry = -1;
+        ImGui.SetNextItemWidth(200 * ImGuiHelpers.GlobalScale);
+        ImGui.SetCursorPosY(whitelistPos.Y);
+        using (var lb = ImRaii.ListBox("##whitelist"))
+        {
+            if (lb)
+            {
+                for (int i = 0; i < playerList.Count; i++)
+                {
+                    bool shouldBeSelected = _selectedEntry == i;
+                    if (ImGui.Selectable(playerList[i] + "##" + i, shouldBeSelected))
+                    {
+                        _selectedEntry = i;
+                    }
+                    string? lastSeenName = _serverConfigurationManager.GetNameForUid(playerList[i]);
+                    if (lastSeenName != null)
+                    {
+                        ImGui.SameLine();
+                        _uiShared.IconText(FontAwesomeIcon.InfoCircle);
+                        UiSharedService.AttachToolTip($"Last seen name: {lastSeenName}");
+                    }
+                }
+            }
+        }
+        using (ImRaii.Disabled(_selectedEntry == -1))
+        {
+            using var pushId = ImRaii.PushId("deleteSelectedWhitelist");
+            if (_uiShared.IconTextButton(FontAwesomeIcon.Trash, "Delete selected UID"))
+            {
+                _serverConfigurationManager.RemoveWhitelistUid(_serverConfigurationManager.Whitelist[_selectedEntry]);
+                _selectedEntry = -1;
+                _playerPerformanceConfigService.Save();
+                recalculatePerformance = true;
+            }
+        }
+#endregion Whitelist
+
+#region Blacklist
+        ImGui.Separator();
+        _uiShared.BigText("Blacklisted UIDs");
+        UiSharedService.TextWrapped("The entries in the list below will never have their characters displayed.");
+        ImGui.SetNextItemWidth(200 * ImGuiHelpers.GlobalScale);
+        var blacklistPos = ImGui.GetCursorPos();
+        ImGui.SetCursorPosX(240 * ImGuiHelpers.GlobalScale);
+        ImGui.InputText("##uid", ref _uidToAddForIgnoreBlacklist, 20);
+        using (ImRaii.Disabled(string.IsNullOrEmpty(_uidToAddForIgnoreBlacklist)))
+        {
+            ImGui.SetCursorPosX(240 * ImGuiHelpers.GlobalScale);
+            if (_uiShared.IconTextButton(FontAwesomeIcon.Plus, "Add UID to blacklist"))
+            {
+                if (!_serverConfigurationManager.IsUidBlacklisted(_uidToAddForIgnoreBlacklist))
+                {
+                    _serverConfigurationManager.AddBlacklistUid(_uidToAddForIgnoreBlacklist);
+                    recalculatePerformance = true;
+                    recalculatePerformanceUID = _uidToAddForIgnoreBlacklist;
+                }
+                _uidToAddForIgnoreBlacklist = string.Empty;
+            }
+        }
+        _uiShared.DrawHelpText("Hint: UIDs are case sensitive.\nVanity IDs are also acceptable.");
+        ImGui.Dummy(new Vector2(10));
+        var blacklist = _serverConfigurationManager.Blacklist;
+        if (_selectedEntryBlacklist > blacklist.Count - 1)
+            _selectedEntryBlacklist = -1;
+        ImGui.SetNextItemWidth(200 * ImGuiHelpers.GlobalScale);
+        ImGui.SetCursorPosY(blacklistPos.Y);
+        using (var lb = ImRaii.ListBox("##blacklist"))
+        {
+            if (lb)
+            {
+                for (int i = 0; i < blacklist.Count; i++)
+                {
+                    bool shouldBeSelected = _selectedEntryBlacklist == i;
+                    if (ImGui.Selectable(blacklist[i] + "##BL" + i, shouldBeSelected))
+                    {
+                        _selectedEntryBlacklist = i;
+                    }
+                    string? lastSeenName = _serverConfigurationManager.GetNameForUid(blacklist[i]);
+                    if (lastSeenName != null)
+                    {
+                        ImGui.SameLine();
+                        _uiShared.IconText(FontAwesomeIcon.InfoCircle);
+                        UiSharedService.AttachToolTip($"Last seen name: {lastSeenName}");
+                    }
+                }
+            }
+        }
+        using (ImRaii.Disabled(_selectedEntryBlacklist == -1))
+        {
+            using var pushId = ImRaii.PushId("deleteSelectedBlacklist");
+            if (_uiShared.IconTextButton(FontAwesomeIcon.Trash, "Delete selected UID"))
+            {
+                _serverConfigurationManager.RemoveBlacklistUid(_serverConfigurationManager.Blacklist[_selectedEntryBlacklist]);
+                _selectedEntryBlacklist = -1;
+                _playerPerformanceConfigService.Save();
+                recalculatePerformance = true;
+            }
+        }
+#endregion Blacklist
+
+        if (recalculatePerformance)
+            Mediator.Publish(new RecalculatePerformanceMessage(recalculatePerformanceUID));
+    }
+
     private static bool InputDtrColors(string label, ref DtrEntry.Colors colors)
     {
         using var id = ImRaii.PushId(label);
@@ -1580,6 +1816,12 @@ public class SettingsUi : WindowMediatorSubscriberBase
         }
     }
 
+    private string _uidToAddForIgnore = string.Empty;
+    private int _selectedEntry = -1;
+
+    private string _uidToAddForIgnoreBlacklist = string.Empty;
+    private int _selectedEntryBlacklist = -1;
+
     private void DrawSettingsContent()
     {
         if (_apiController.ServerState is ServerState.Connected)
@@ -1605,6 +1847,12 @@ public class SettingsUi : WindowMediatorSubscriberBase
                 ImGui.EndTabItem();
             }
 
+            if (ImGui.BeginTabItem("Performance"))
+            {
+                DrawPerformance();
+                ImGui.EndTabItem();
+            }
+
             if (ImGui.BeginTabItem("Export & Storage"))
             {
                 DrawFileStorageSettings();