diff --git a/src/AcDream.App/Rendering/ParticleRenderer.cs b/src/AcDream.App/Rendering/ParticleRenderer.cs
index e47fc338..c5f5f453 100644
--- a/src/AcDream.App/Rendering/ParticleRenderer.cs
+++ b/src/AcDream.App/Rendering/ParticleRenderer.cs
@@ -123,6 +123,11 @@ public sealed unsafe class ParticleRenderer : IDisposable
         ParticleRenderPass renderPass = ParticleRenderPass.Scene,
         Func<AcDream.Core.Vfx.ParticleEmitter, bool>? emitterFilter = null)
     {
+        // THROWAWAY FPS apparatus: glFinish-bracket particle GPU (ACDREAM_FPS_PROF).
+        System.Diagnostics.Stopwatch? _pSw = null;
+        if (AcDream.App.Rendering.FrameProfiler.PassGpuEnabled) { _gl.Finish(); _pSw = System.Diagnostics.Stopwatch.StartNew(); }
+        try
+        {
         if (particles is null || camera is null)
             return;
 
@@ -168,6 +173,15 @@ public sealed unsafe class ParticleRenderer : IDisposable
         _gl.BindVertexArray(0);
         _gl.DepthMask(true);
         _gl.Disable(EnableCap.Blend);
+        }
+        finally
+        {
+            if (_pSw is not null)
+            {
+                _gl.Finish();
+                AcDream.App.Rendering.FrameProfiler.AddRendererGpu("particles", _pSw.Elapsed.TotalMilliseconds);
+            }
+        }
     }
 
     private List<ParticleDraw> BuildDrawList(
diff --git a/src/AcDream.App/Rendering/PortalDepthMaskRenderer.cs b/src/AcDream.App/Rendering/PortalDepthMaskRenderer.cs
index 4f0a6436..79a48d2c 100644
--- a/src/AcDream.App/Rendering/PortalDepthMaskRenderer.cs
+++ b/src/AcDream.App/Rendering/PortalDepthMaskRenderer.cs
@@ -208,6 +208,12 @@ void main() { }   // depth-only: color writes are masked off by the caller state
         ReadOnlySpan<Vector4> planes,
         bool forceFarZ)
     {
+        // THROWAWAY FPS apparatus: glFinish-bracket each punch/seal fan (accumulated
+        // into "punchseal") under ACDREAM_FPS_PROF.
+        System.Diagnostics.Stopwatch? _fSw = null;
+        if (AcDream.App.Rendering.FrameProfiler.PassGpuEnabled) { _gl.Finish(); _fSw = System.Diagnostics.Stopwatch.StartNew(); }
+        try
+        {
         if (worldVerts.Length < 3)
             return;
         int n = Math.Min(worldVerts.Length, MaxFanVerts);
@@ -305,6 +311,15 @@ void main() { }   // depth-only: color writes are masked off by the caller state
         _gl.CullFace(TriangleFace.Back);
         _gl.FrontFace(FrontFaceDirection.CW);
         _gl.UseProgram(0);
+        }
+        finally
+        {
+            if (_fSw is not null)
+            {
+                _gl.Finish();
+                AcDream.App.Rendering.FrameProfiler.AddRendererGpu("punchseal", _fSw.Elapsed.TotalMilliseconds);
+            }
+        }
     }
 
     public void Dispose()