diff --git a/src/Modules/MeshLod/MeshLodInjector.cs b/src/Modules/MeshLod/MeshLodInjector.cs
index fbf994d..06a2d95 100644
--- a/src/Modules/MeshLod/MeshLodInjector.cs
+++ b/src/Modules/MeshLod/MeshLodInjector.cs
@@ -12,7 +12,6 @@ static class MeshLodInjector
 {
     static MeshLodSettings _settings = new();
     static readonly List<WeakReference<Car>> _trackedCars = new();
-    static Material? _bboxMat;
 
     // Debounced auto-refresh: set by MarkDirty, consumed by CheckAutoRefresh (called from Update).
     static float _pendingRefreshAt = -1f;
@@ -33,7 +32,6 @@ static class MeshLodInjector
     {
         _trackedCars.Clear();
         _pendingRefreshAt = -1f;
-        if (_bboxMat != null) { UnityEngine.Object.Destroy(_bboxMat); _bboxMat = null; }
     }
 
     public static (int total, int locos, int freight) GetTrackedCounts()
@@ -129,6 +127,11 @@ static class MeshLodInjector
         try
         {
             ApplyLods(car, renderers);
+            // Opportunistically drop dead weak-refs so the list can't grow unbounded over a
+            // long session of cars loading/unloading (RefreshAll also compacts, but only runs
+            // when a setting changes). Cheap: the modulo check runs once per car load.
+            if (_trackedCars.Count > 0 && _trackedCars.Count % 128 == 0)
+                _trackedCars.RemoveAll(wr => !wr.TryGetTarget(out _));
             _trackedCars.Add(new WeakReference<Car>(car));
         }
         catch (Exception ex) { Log.Warn($"MeshLOD: apply failed for {car.DisplayName}: {ex.Message}"); }
@@ -208,9 +211,12 @@ static class MeshLodInjector
         Renderer[] lod2Rend = sorted.Take(lod2Keep).Cast<Renderer>().ToArray();
 
         // LOD3: 12-triangle proxy box derived from the largest renderer's mesh-local AABB.
+        // Reuse the largest renderer's own material so the box matches the car's colour
+        // (a shared/tinted material can't match per-car, and Material.color sets the legacy
+        // _Color, not URP's _BaseColor — both reasons the previous matte material rendered gray).
         Bounds localBounds = ComputeMeshLocalBounds(sorted[0], bodyRoot);
         MeshRenderer bboxMr = CreateBoundingBoxRenderer(bodyRoot, localBounds,
-                                                         GetOrCreateBBoxMat(sorted[0].sharedMaterial),
+                                                         sorted[0].sharedMaterial,
                                                          sorted[0].gameObject.layer);
         Renderer[] lod3Rend = new[] { (Renderer)bboxMr };
 
@@ -261,7 +267,14 @@ static class MeshLodInjector
         }
 
         Transform? bbox = car.BodyTransform.Find("S3_BBox");
-        if (bbox != null) UnityEngine.Object.Destroy(bbox.gameObject);
+        if (bbox != null)
+        {
+            // Destroy the procedural box mesh too: destroying the GameObject alone leaves
+            // the Mesh asset alive until scene unload (a small leak on every refresh).
+            MeshFilter? bf = bbox.GetComponent<MeshFilter>();
+            if (bf != null && bf.sharedMesh != null) UnityEngine.Object.Destroy(bf.sharedMesh);
+            UnityEngine.Object.Destroy(bbox.gameObject);
+        }
     }
 
     // ── Bounds helpers ────────────────────────────────────────────────────────
@@ -316,26 +329,6 @@ static class MeshLodInjector
 
     // ── Proxy box mesh ────────────────────────────────────────────────────────
 
-    // One matte material shared across all proxy boxes; tinted to the car body's
-    // albedo so it looks approximately correct under any lighting / post-processing.
-    // Tries URP first since Railroader uses the Universal Render Pipeline.
-    static Material GetOrCreateBBoxMat(Material? src)
-    {
-        if (_bboxMat != null) return _bboxMat;
-        var shader = Shader.Find("Universal Render Pipeline/Lit")
-                  ?? Shader.Find("Universal Render Pipeline/Simple Lit")
-                  ?? Shader.Find("Standard")
-                  ?? Shader.Find("Legacy Shaders/Diffuse");
-        _bboxMat = shader != null ? new Material(shader) : new Material(src);
-        _bboxMat.color = src != null && src.HasProperty("_Color")
-            ? src.color
-            : new Color(0.45f, 0.45f, 0.45f);
-        if (_bboxMat.HasProperty("_Metallic"))   _bboxMat.SetFloat("_Metallic",   0f);
-        if (_bboxMat.HasProperty("_Glossiness")) _bboxMat.SetFloat("_Glossiness", 0.1f); // built-in
-        if (_bboxMat.HasProperty("_Smoothness")) _bboxMat.SetFloat("_Smoothness", 0.1f); // URP
-        return _bboxMat;
-    }
-
     static MeshRenderer CreateBoundingBoxRenderer(Transform parent, Bounds localBounds,
                                                    Material mat, int layer)
     {
diff --git a/src/Modules/PhysicsOptimizer/PhysicsTimer.cs b/src/Modules/PhysicsOptimizer/PhysicsTimer.cs
index e66f8e3..f051d91 100644
--- a/src/Modules/PhysicsOptimizer/PhysicsTimer.cs
+++ b/src/Modules/PhysicsOptimizer/PhysicsTimer.cs
@@ -102,7 +102,7 @@ public static class PhysicsTimer
         _frames         = 0;
     }
 
-    // Called from PhysicsOverlayGUI.LateUpdate() to capture render frame time.
+    // Called from ProfilerOverlayGUI.LateUpdate() to capture render frame time.
     public static void RecordRenderFrame(float deltaMs)
     {
         _lastInstantRenderMs = deltaMs; // sampled into RingRender on the next RecordFrame call