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byrongamatosandClaude Opus 4.8
3b862ba117
scripts/perf-baseline.mjs gains a `--song` mode: it wraps requestAnimationFrame before any page script, TAGS the frames the highway actually painted (via highway.addDrawHook), starts playback, and reports draw-frame p50/p95/p99 over `--frames` seconds across `--runs` runs. Tagging is the point — ~half the rAF callbacks are other cheap loops (~0.1 ms); averaging them in would hide a renderer regression, so only draw frames are counted. This is the metric the plan says gates the highway.js split (R3c) but the harness never measured (it did server latency + boot + heap only, and the R0 numbers were against an empty library). docs/perf-baseline.md now records the pre-lift baseline on the Arcturus feedpak: p50 ~2.2 ms, p95 spread 2.7-3.2 ms across 3 runs. The H-container lift (next) re-runs this on the same box and must stay within noise. Maintainer/CI-only tooling; the existing no-`--song` run is unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
