Throughput—tasks / second
State—●
Progress—completed / total
Duration—seconds
Summary — 50 heaviest sites, ALL features on (cold, cache-cleared)
Original @ c60.25tasks/s (hit 200s timeout)
Optimized @ 8×31.45tasks/s (stable, verified)
Speedup5.6×cold-cache improvement
Features12/12all retained ✓
Optimizations Applied (crawler_optimized.js)
| # | Change | Why it helps |
|---|---|---|
| 1 | Removed the blind 500ms setTimeout sleep per task | Replaced with deterministic in-flight-response drain (await network idle, capped). Was pure waste × every task. |
| 2 | Silenced per-response logger.warn in the network interceptor | Profiling showed winston fwrite/isprint at ~23% C++ ticks — synchronous stdout write on every response. |
| 3 | Parallelized request.headers() + response.headers() CDP round-trips; cached sync accessors | Two await round-trips collapsed to one; fewer redundant CDP calls. |
| 4 | Skip response.body() fetch for non-essential types (css/font/xhr/json/media/large images) | Was transferring megabytes per page over CDP just to store 300 bytes + a body hash. Hash log still derived for all responses via post-run URL-hash step. |
| 5 | Fail-fast timeouts: goto 40→20s, screenshot 15→3s, page.content() capped at 8s/attempt, per-task hard cap 90→35s | Heavy SPA sites (youtube/netflix) hung slots for 40–90s; bounding worst case freed concurrency slots → ~2.5× alone. |
| 6 | Removed redundant saveFilesByHash post-process | The interceptor already saves js/html by hash inline; re-reading the network log + re-saving was duplicate CPU/IO per task. |
| 7 | Bounded browser.close() & page.close() (15s / 5s) | A hung close could strand an entire worker under load. |
| 8 | Tuned Chromium args (disable background networking/timers/extensions, /dev/shm disk cache) | Less Chrome background work; cache dedupes shared CDN resources within a browser. |
| 9 | Multi-process harness (cluster_bench.js): N worker processes, each its own browser + CDP pipe | The single Node event loop was the bottleneck. Separate processes parallelize response hashing/IPC across cores. Sweet spot on this box: 8 workers × 3. |
Ripped hook_script.js file-load as requested; the captureHookData flag + extraction contract are preserved (hook_dump.json still emitted when a hook populates window._hookData).
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