0.2.6-dev: impostor boxes without the setup-pose floor (#542) — a model frozen before its first update (built while stunned without a stun clip, or dead without a death or idle clip) shows its clip's first frame instead of its setup pose, the box's core is the idle clip (looping clips up to 5× it, one-off clips 2×), and PIXI gets a vertex buffer per batch flush (the per-slot scissor's flushes stalled Apple GPUs: 42–58 → 60 fps for 120 units at 1920 × 1080); golden: unchanged

public/js/render/app.js

@@ -192,6 +192,12 @@ export async function createFieldView(host, options = {}) {
   let view = null;
   let onAbort;
   try {
+  // a vertex buffer of its own for every batch flush of a frame (PIXI's own setting on iOS) instead of uploading the one
+  // shared buffer again: the impostor atlas flushes once per redrawn slot (render/impostor.js: each slot is clipped by its
+  // own scissor rect, GitHub #542), and with those flushes the re-uploads stalled Apple GPUs — on an Apple M4 (Chrome,
+  // ANGLE Metal) a 120-unit crowd at 1920 × 1080 ran at 42–58 fps instead of 60 (DPR 1 and 2, by the machine's load);
+  // a buffer per flush costs ≈ 0.3 ms of render CPU there
+  if (P.BatchRenderer && 'canUploadSameBuffer' in P.BatchRenderer) P.BatchRenderer.canUploadSameBuffer = false;
   const app = new P.Application({
     // MSAA only where it pays: dense (DPR ≥ 1.5) screens are sharp enough without it and it would cost 4× the fill
     // transparent: the 3D board canvas shows through (the 2D board paints an opaque backdrop itself)