diff --git a/src/AcDream.App/Streaming/StreamingController.cs b/src/AcDream.App/Streaming/StreamingController.cs
index 79f1740a..2e1f8682 100644
--- a/src/AcDream.App/Streaming/StreamingController.cs
+++ b/src/AcDream.App/Streaming/StreamingController.cs
@@ -122,6 +122,16 @@ public sealed class StreamingController
     /// </summary>
     public int PriorityRadius { get; set; }
 
+    // [FRAME-DIAG] (read by GameWindow's ACDREAM_WB_DIAG rollup): the standing
+    // deferred-LOAD backlog. A non-zero value during/after a teleport is the
+    // GPU-upload tail draining at MaxCompletionsPerFrame. Removable probe surface.
+    public int DeferredApplyBacklog => _deferredApply.Count;
+
+    // [FRAME-DIAG]: how many times ForceReloadWindow has fired (each one drops +
+    // re-uploads the WHOLE window) and the landblock count it dropped last time.
+    public int ForceReloadCount { get; private set; }
+    public int LastForceReloadDropCount { get; private set; }
+
     // Completions that were drained past a priority item get buffered here
     // so they still apply over subsequent frames without loss.
     private readonly List<LandblockStreamResult> _deferredApply = new();
@@ -361,6 +371,8 @@ public sealed class StreamingController
         _collapsed = false;
         // Snapshot — RemoveLandblock mutates the loaded set we're iterating.
         var ids = new List<uint>(_state.LoadedLandblockIds);
+        ForceReloadCount++;                       // [FRAME-DIAG] churn counter
+        LastForceReloadDropCount = ids.Count;     // = upcoming re-upload volume
         foreach (var id in ids)
         {
             _state.RemoveLandblock(id);