Fix render pacing and profiler readback

Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

docs/.vitepress/Playground.vue

@@ -292,7 +292,7 @@ onUnmounted(() => {
             <span>{{ adapterInfo || profile.adapter }}</span>
             <span>
               {{ profile.canvas.width }}×{{ profile.canvas.height }} ·
-              {{ profile.wallMilliseconds.toFixed(2) }} ms wall
+              {{ profile.readbackMilliseconds.toFixed(2) }} ms readback latency
             </span>
           </div>
           <p v-if="profilerSupported === false">

docs/.vitepress/playgrounds.js

@@ -402,7 +402,7 @@ for (let y = 0; y < 64; y++) {
   }
 }
 
-const scene = new Scene(canvas, { fps: 1000, hdr: true });
+const scene = new Scene(canvas, { hdr: true });
 await scene.ready;
 log("Benchmark core ready; preparing geometry…");
 const camera = new ArcRotateCamera(scene, {