hermes-agent/apps/desktop/scripts/perf/scenarios
brooklyn! b1fb3c5285
bench(desktop): measure the full picture — prod build, cold-start, first-token (#67697)
Stop drip-feeding scenarios: extend the harness to cover the latencies that
actually dominate perceived speed, and measure them on a REAL production build.

- --prod: build a production renderer with the probe included (VITE_PERF_PROBE=1,
  off in normal builds) and launch it from dist/. Measures minified React, so
  numbers are representative shipped figures instead of ~3x-inflated dev ones.
- cold-start scenario (tier "cold"): launch → CDP → driver → first paint, via a
  fresh isolated spawn per run. Captures spawn_to_cdp_ms, spawn_to_driver_ms, fcp_ms.
- first-token scenario (backend tier): Enter → first assistant token painted —
  the TTFT latency an agent app is uniquely judged on.
- run.mjs gained --prod (build once), cold-start fresh-spawn loop, and gates
  ci+cold tiers against the baseline.

Baseline re-captured on a PRODUCTION build (median of 5), darwin-arm64 — all
green. Representative numbers:
  cold-start  spawn→interactive ~1.6s, FCP ~0.5s
  stream      frame p95 22ms, 1 longtask
  keystroke   p50 2ms, p95 8.7ms
  transcript  mount 145ms, 82ms longtask (400-msg open)

The prod build also settled the open question from the dev numbers: the
transcript-mount "lead" (221ms longtask in dev) is only ~72-82ms in prod — not
actionable. Measurement did its job.
2026-07-19 17:52:39 -05:00
..
cold-start.mjs bench(desktop): measure the full picture — prod build, cold-start, first-token (#67697) 2026-07-19 17:52:39 -05:00
first-token.mjs bench(desktop): measure the full picture — prod build, cold-start, first-token (#67697) 2026-07-19 17:52:39 -05:00
index.mjs bench(desktop): measure the full picture — prod build, cold-start, first-token (#67697) 2026-07-19 17:52:39 -05:00
keystroke.mjs bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466) 2026-07-19 07:41:00 -04:00
profile-switch.mjs bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466) 2026-07-19 07:41:00 -04:00
session-switch.mjs bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466) 2026-07-19 07:41:00 -04:00
stream.mjs bench(desktop): trustworthy --spawn stream numbers + real baseline (#67694) 2026-07-19 21:30:40 +00:00
submit.mjs bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466) 2026-07-19 07:41:00 -04:00
transcript.mjs bench(desktop): systematized perf harness; sunset 12 one-off scripts (#67466) 2026-07-19 07:41:00 -04:00