Improve videos

video/src/record.ts

@@ -51,6 +51,31 @@ async function recordOne(storyboard: Storyboard): Promise<void> {
     const u = r.url();
     if (u.includes('ai-filters')) console.log(`[req] ${r.method()} ${u}`);
   });
+  // Debug instrumentation: per-second request-rate histogram by path bucket.
+  // The desktop take intermittently freezes for ~30s after heavy filter
+  // churn; this shows whether a request flood is what's choking the page.
+  if (process.env.VIDEO_DEBUG_REQ_RATE === '1') {
+    const counts = new Map<string, number>();
+    page.on('request', (r) => {
+      let bucket: string;
+      try {
+        const u = new URL(r.url());
+        bucket = u.pathname.split('/').slice(0, 3).join('/');
+      } catch {
+        bucket = 'other';
+      }
+      counts.set(bucket, (counts.get(bucket) ?? 0) + 1);
+    });
+    const timer = setInterval(() => {
+      if (counts.size === 0) return;
+      const top = [...counts.entries()].sort((a, b) => b[1] - a[1]).slice(0, 5);
+      console.log(
+        `[req-rate] ${top.map(([k, v]) => `${k}=${v}`).join(' ')}`
+      );
+      counts.clear();
+    }, 1000);
+    timer.unref();
+  }
 
   await installDemoRoutes(page, storyboard);
   const ctx = await prepareTimeline(page, storyboard);