Fix Throttling

Core/RenderManager.cs

@@ -11,6 +11,7 @@ using ADOFAIRenderer.Util.FFmpeg;
 using MelonLoader;
 using MelonLoader.Utils;
 using UnityEngine;
+using UnityEngine.Rendering;
 using Random = UnityEngine.Random;
 using ThreadPriority = System.Threading.ThreadPriority;
 
@@ -273,7 +274,8 @@ namespace ADOFAIRenderer.Core
                     isThrottling = true;
                     throttleCount++;
                 }
-                Thread.Sleep(1);
+                
+                AsyncGPUReadback.WaitAllRequests();
             }
             isThrottling = false;
 
@@ -581,7 +583,7 @@ namespace ADOFAIRenderer.Core
                 {
                     foreach (var kvp in ImageQueue.Values)
                     {
-                        if (kvp.ManagedBuffer != null && kvp.ManagedBuffer.Length > 0)
+                        if (kvp.ManagedBuffer is { Length: > 0 })
                         {
                             ArrayPool<byte>.Shared.Return(kvp.ManagedBuffer);
                         }