47 lines
2.5 KiB
Markdown
47 lines
2.5 KiB
Markdown
# Phase 6 report
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Tested `4b1f520`, from Phase 5 `21c1273`. Adjacent-commit measurements isolate
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`5d6a154`: WebKit/LTE FCP 1032→1615 ms. Its selected classic CSS arrived late
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(1540–1711 ms); worker installation started after paint. Fonts matched their
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preloads. Default/force-cache and HTTP-cache handoff trials still transferred
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app.js twice.
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Shipped early classic style discovery (`e7a7cdc`), a single verified page-owned
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WebKit response and specific CSP hash (`a86fa1c`, refined through `9408ee0`),
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worker-owned stale-core contract protection (`97eb31e`), and native parser boot
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with low-priority app preloading (`4b1f520`). The loader shares the existing final
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core script; core contract 2 prevents unsafe old packing fallback. app.js,
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playback and sw-update.js are unchanged.
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Five-run final medians:
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| Engine/profile | Phase 5→6 FCP ms | Phase 5→6 cold bytes | app bodies |
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|---|---:|---:|---:|
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| WebKit/LTE | 1739→905 | 1097048→983326 | 2→1 |
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| WebKit/lossy | 4303→2748 | 1105402→990152 | 2→1 |
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| Chromium/LTE | 1356→1388 | 651012→653267 | 1→1 |
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| Chromium/lossy | 2052→1976 | 651096→653267 | 1→1 |
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WebKit paint, one-body and below-baseline wire targets pass (−16.6%/−16.1%
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versus original wire baseline). Phase 2 measured 1044/4045 ms over three runs.
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Strict zero regression is **not achieved**: Chrome/LTE FCP +32 ms, cold bytes
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+0.35%, long tasks 278→304 ms; warm boots Chrome 410/403→418/442 and WebKit
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83/85→88/89 ms. Metadata adds ~0.4 KB per core update. Added loader/security
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work has a cost; complete timing attribution remains unproved. Contemporary
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Phase 5 controls and all offline/update deltas appear in
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[phase6-verification.md](phase6-verification.md), with actual command excerpts.
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Chromium cold boot improves 7043/11342→6478/10314 ms.
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Migration passes both engines with/without stalls; banner once, explicit legacy
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refresh, old URLs, N-1, offline and playback guards. Lazy/layout/feature seams,
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hidden timers, both rollback modes, 223 frontend/184 server/3 measurement tests
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pass. No fonts/icons re-downloaded. ASSET_HASHING=0 and ASSET_SYNC=0 remain.
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Real iPhone install/update, quota pressure and 30-minute locked-screen audio
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require owner checks. The historical fixture measures home launch, not autoplay.
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Post-crash verification retained in `6f0235f`: both-engine migrations, offline
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layouts/features, rollback and cold smoke pass. WebKit smoke FCP 1253/2881 ms
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(LTE/lossy), one app response each. Durable five-run results remain authoritative.
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