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Vance IngallsandClaude Fable 5
c8edeef43b
Re-measured the four rows flagged slower-than-baseline with matched conditions (3 reps, medians). Two were stale-baseline artifacts: style-7 macOS is actually 1.12x FASTER (19.9s vs 22.4s) and raf-ball macOS is exactly 1.00x. variables-prod Docker is within the noise band (6.8s vs 6.5s across runs spanning 6.4-10.7s). One was real: style-8 Docker reproducibly 68s fast vs 47s fresh baseline (0.69x). Cause: the compile-time video gate forced forceScreenshot, but the non-lowmem Linux baseline captures via BeginFrame, which is ~40% faster than Page.captureScreenshot on SwiftShader. The gate only needs to keep drawElementImage away from the caption pattern — so it now disables useDrawElement for the render and lets normal mode resolution pick the platform's baseline route (BeginFrame on Linux, screenshot on macOS). Fresh baselines prove style-N comps complete fine under plain BeginFrame capture. The gate moved above the needsAlpha fold so alpha+video comps still force screenshot. Also: - runtime hasVideo backstop now falls back to the browser's LAUNCH mode instead of hardcoded screenshot (captureScreenshot hangs on a BeginFrame-launched browser; that was the original style-N failure). - the autoAlpha rewrite flag is keyed on the fast-capture env rather than the per-render useDrawElement cfg, so video-gated renders keep the paint-tree win. style-8 Docker fast: 68.2s -> 46.6/47.6s (parity with 44.8-49.0s baseline), 54.1 dB. mac style-7: 54.4 dB unchanged. Alpha fast path still drawElement at rgba PSNR = inf. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>