Record phase 6 measurements and compatibility verification
This commit is contained in:
Jonathan Sykes
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perf/results/phase6-before-phase2-lossy.json
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perf/results/phase6-before-phase2-lossy.json
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perf/results/phase6-chromium-cold-2026-10-08.json
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perf/results/phase6-chromium-cold-2026-10-08.json
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perf/results/phase6-final-2026-10-08.json
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perf/results/phase6-final-2026-10-08.json
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perf/results/phase6-hashing-rollback-2026-10-08.json
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perf/results/phase6-hashing-rollback-2026-10-08.json
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perf/results/phase6-low-app-priority.json
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perf/results/phase6-low-app-priority.json
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perf/results/phase6-matched-phase5-2026-10-08.json
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perf/results/phase6-matched-phase5-2026-10-08.json
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perf/results/phase6-matched-phase5-cold.json
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perf/results/phase6-matched-phase5-cold.json
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perf/results/phase6-merged-bootstrap-cold.json
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perf/results/phase6-merged-bootstrap-cold.json
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perf/results/phase6-merged-bootstrap-warm.json
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perf/results/phase6-merged-bootstrap-warm.json
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perf/results/phase6-migration-lossy-2026-10-08.json
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41830
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Load Diff
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191
perf/results/phase6-native-parser-warm.json
Normal file
191
perf/results/phase6-native-parser-warm.json
Normal file
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2199
perf/results/phase6-regression-2026-10-08.json
Normal file
2199
perf/results/phase6-regression-2026-10-08.json
Normal file
File diff suppressed because it is too large
Load Diff
28
perf/results/phase6-seams-2026-10-08.json
Normal file
28
perf/results/phase6-seams-2026-10-08.json
Normal file
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perf/results/phase6-sync-rollback-2026-10-08.json
Normal file
135
perf/results/phase6-sync-rollback-2026-10-08.json
Normal file
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||||||
|
"runsConfigured": 1,
|
||||||
|
"browsers": {
|
||||||
|
"chromium": {
|
||||||
|
"lte": {
|
||||||
|
"offline": {
|
||||||
|
"requestCount": {
|
||||||
|
"median": 0,
|
||||||
|
"min": 0,
|
||||||
|
"max": 0,
|
||||||
|
"values": [
|
||||||
|
0
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"wireBytes": {
|
||||||
|
"median": 0,
|
||||||
|
"min": 0,
|
||||||
|
"max": 0,
|
||||||
|
"values": [
|
||||||
|
0
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"fcp": {
|
||||||
|
"median": 44,
|
||||||
|
"min": 44,
|
||||||
|
"max": 44,
|
||||||
|
"values": [
|
||||||
|
44
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"lcp": {
|
||||||
|
"median": 44,
|
||||||
|
"min": 44,
|
||||||
|
"max": 44,
|
||||||
|
"values": [
|
||||||
|
44
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"domContentLoaded": {
|
||||||
|
"median": 151,
|
||||||
|
"min": 151,
|
||||||
|
"max": 151,
|
||||||
|
"values": [
|
||||||
|
151
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"bootDone": {
|
||||||
|
"median": 157,
|
||||||
|
"min": 157,
|
||||||
|
"max": 157,
|
||||||
|
"values": [
|
||||||
|
157
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"reloadDuration": {
|
||||||
|
"median": 173,
|
||||||
|
"min": 173,
|
||||||
|
"max": 173,
|
||||||
|
"values": [
|
||||||
|
173
|
||||||
|
]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"webkit": {
|
||||||
|
"lte": {
|
||||||
|
"offline": {
|
||||||
|
"requestCount": {
|
||||||
|
"median": 0,
|
||||||
|
"min": 0,
|
||||||
|
"max": 0,
|
||||||
|
"values": [
|
||||||
|
0
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"wireBytes": {
|
||||||
|
"median": 0,
|
||||||
|
"min": 0,
|
||||||
|
"max": 0,
|
||||||
|
"values": [
|
||||||
|
0
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"fcp": {
|
||||||
|
"median": 68,
|
||||||
|
"min": 68,
|
||||||
|
"max": 68,
|
||||||
|
"values": [
|
||||||
|
68
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"lcp": {
|
||||||
|
"median": 101,
|
||||||
|
"min": 101,
|
||||||
|
"max": 101,
|
||||||
|
"values": [
|
||||||
|
101
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"domContentLoaded": {
|
||||||
|
"median": 98,
|
||||||
|
"min": 98,
|
||||||
|
"max": 98,
|
||||||
|
"values": [
|
||||||
|
98
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"bootDone": {
|
||||||
|
"median": 102,
|
||||||
|
"min": 102,
|
||||||
|
"max": 102,
|
||||||
|
"values": [
|
||||||
|
102
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"reloadDuration": {
|
||||||
|
"median": 118,
|
||||||
|
"min": 118,
|
||||||
|
"max": 118,
|
||||||
|
"values": [
|
||||||
|
118
|
||||||
|
]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
22215
perf/results/phase6-webkit-cold-2026-10-08.json
Normal file
22215
perf/results/phase6-webkit-cold-2026-10-08.json
Normal file
File diff suppressed because it is too large
Load Diff
42
plans/phase6-report.md
Normal file
42
plans/phase6-report.md
Normal file
@@ -0,0 +1,42 @@
|
|||||||
|
# Phase 6 report
|
||||||
|
|
||||||
|
Tested `4b1f520`, from Phase 5 `21c1273`. Adjacent-commit measurements isolate
|
||||||
|
`5d6a154`: WebKit/LTE FCP 1032→1615 ms. Its selected classic CSS arrived late
|
||||||
|
(1540–1711 ms); worker installation started after paint. Fonts matched their
|
||||||
|
preloads. Default/force-cache and HTTP-cache handoff trials still transferred
|
||||||
|
app.js twice.
|
||||||
|
|
||||||
|
Shipped early classic style discovery (`e7a7cdc`), a single verified page-owned
|
||||||
|
WebKit response and specific CSP hash (`a86fa1c`, refined through `9408ee0`),
|
||||||
|
worker-owned stale-core contract protection (`97eb31e`), and native parser boot
|
||||||
|
with low-priority app preloading (`4b1f520`). The loader shares the existing final
|
||||||
|
core script; core contract 2 prevents unsafe old packing fallback. app.js,
|
||||||
|
playback and sw-update.js are unchanged.
|
||||||
|
|
||||||
|
Five-run final medians:
|
||||||
|
|
||||||
|
| Engine/profile | Phase 5→6 FCP ms | Phase 5→6 cold bytes | app bodies |
|
||||||
|
|---|---:|---:|---:|
|
||||||
|
| WebKit/LTE | 1739→905 | 1097048→983326 | 2→1 |
|
||||||
|
| WebKit/lossy | 4303→2748 | 1105402→990152 | 2→1 |
|
||||||
|
| Chromium/LTE | 1356→1388 | 651012→653267 | 1→1 |
|
||||||
|
| Chromium/lossy | 2052→1976 | 651096→653267 | 1→1 |
|
||||||
|
|
||||||
|
WebKit paint, one-body and below-baseline wire targets pass (−16.6%/−16.1%
|
||||||
|
versus original wire baseline). Phase 2 measured 1044/4045 ms over three runs.
|
||||||
|
|
||||||
|
Strict zero regression is **not achieved**: Chrome/LTE FCP +32 ms, cold bytes
|
||||||
|
+0.35%, long tasks 278→304 ms; warm boots Chrome 410/403→418/442 and WebKit
|
||||||
|
83/85→88/89 ms. Metadata adds ~0.4 KB per core update. Added loader/security
|
||||||
|
work has a cost; complete timing attribution remains unproved. Contemporary
|
||||||
|
Phase 5 controls and all offline/update deltas appear in
|
||||||
|
[phase6-verification.md](phase6-verification.md), with actual command excerpts.
|
||||||
|
Chromium cold boot improves 7043/11342→6478/10314 ms.
|
||||||
|
|
||||||
|
Migration passes both engines with/without stalls; banner once, explicit legacy
|
||||||
|
refresh, old URLs, N-1, offline and playback guards. Lazy/layout/feature seams,
|
||||||
|
hidden timers, both rollback modes, 223 frontend/184 server/3 measurement tests
|
||||||
|
pass. No fonts/icons re-downloaded. ASSET_HASHING=0 and ASSET_SYNC=0 remain.
|
||||||
|
|
||||||
|
Real iPhone install/update, quota pressure and 30-minute locked-screen audio
|
||||||
|
require owner checks. The historical fixture measures home launch, not autoplay.
|
||||||
168
plans/phase6-verification.md
Normal file
168
plans/phase6-verification.md
Normal file
@@ -0,0 +1,168 @@
|
|||||||
|
# Phase 6 verification
|
||||||
|
|
||||||
|
Final product under test: `4b1f520` (Phase 5 parent `21c1273`). No production requests.
|
||||||
|
All historical source worktrees contain matching server and frontend revisions.
|
||||||
|
The complete diagnostic waterfalls and five-run acceptance samples are committed
|
||||||
|
under `perf/results/phase6-*.json`. KB in these tables means 1,000 bytes.
|
||||||
|
|
||||||
|
## Cause and controlled trials
|
||||||
|
|
||||||
|
See [phase6-investigation.md](phase6-investigation.md) for the three-run tip
|
||||||
|
comparisons, adjacent-commit bisect, rejected cache/handoff prototypes and fixes.
|
||||||
|
The regressing commit is `5d6a154`: LTE FCP 1,032 → 1,615 ms immediately across
|
||||||
|
that cut. Phase 2/3/5 medians are 1,044/1,646/1,736 ms. Phase 4 extraction did
|
||||||
|
not introduce the paint regression.
|
||||||
|
|
||||||
|
Representative WebKit/LTE sample 2, proxy times relative to tracking start:
|
||||||
|
|
||||||
|
| Request | Phase 5 start/end ms | Phase 6 start/end ms |
|
||||||
|
|---|---:|---:|
|
||||||
|
| lazy.js | 250/417 | 250/418 |
|
||||||
|
| styles.css | 251/570 | 251/570 |
|
||||||
|
| theme-classic.css | 1540/1711 | 250/421 |
|
||||||
|
| page app.js | 1524/2273 | 1552/2297 |
|
||||||
|
| first sw.js | 2337/2533 | 2367/2564 |
|
||||||
|
| worker app.js | 2903/3651 | absent |
|
||||||
|
| FCP | 1736 | 905 |
|
||||||
|
|
||||||
|
The stylesheet becomes available before the parser applies it. The worker starts
|
||||||
|
after paint. Default fetch caching was already in the modern synchronizer;
|
||||||
|
force-cache and a page-to-worker HTTP-cache handoff both still transferred two
|
||||||
|
app bodies in WebKit. A single page-owned response, verified and cached before
|
||||||
|
boot registers the worker, removes the redundant app transfer. Controlled pages
|
||||||
|
and other engines retain native external scripts; no window cache/hash lookup
|
||||||
|
is added to those paths. Each retained stale app requires all shell contracts
|
||||||
|
to match, enforced by the worker.
|
||||||
|
|
||||||
|
## Final measurements
|
||||||
|
|
||||||
|
Exact final command (120 samples: both engines, both profiles, six scenarios,
|
||||||
|
five fresh samples each):
|
||||||
|
|
||||||
|
```sh
|
||||||
|
node perf/baseline.mjs --runs 5 --browser all --profile all --scenario all --assert-cold --out perf/results/phase6-final-2026-10-08.json
|
||||||
|
```
|
||||||
|
|
||||||
|
Final app.js positive-byte responses are exactly one in all 20 cold samples.
|
||||||
|
The earlier separate cold/regression datasets used 9408ee0 and are diagnostics,
|
||||||
|
not the final acceptance build. `phase6-native-auto-priority-2026-10-08.json`
|
||||||
|
combines that rejected intermediate sweep. Final core contract is 2: the final
|
||||||
|
section-rail script now owns the loader; a stale pre-packing section script would
|
||||||
|
not load app.js. No Phase 5 SHELL file was deleted. app.js and sw-update.js remain
|
||||||
|
byte-for-byte unchanged.
|
||||||
|
|
||||||
|
Actual final command output excerpts:
|
||||||
|
|
||||||
|
```text
|
||||||
|
Chromium/LTE: run 4/5... done (653267 bytes, 115 reqs, fcp=1396ms, boot=6478ms)
|
||||||
|
Chromium/lossy: run 2/5... done (653267 bytes, 115 reqs, fcp=1972ms, boot=10292ms)
|
||||||
|
WebKit/LTE: run 2/5... done (983326 bytes, 158 reqs, fcp=905ms, boot=2335ms)
|
||||||
|
WebKit/lossy: run 2/5... done (990152 bytes, 161 reqs, fcp=2748ms, boot=5046ms)
|
||||||
|
```
|
||||||
|
|
||||||
|
WebKit FCP targets (≤1300/3800 ms) pass. Contemporary Phase 2 three-run medians:
|
||||||
|
1044/4045 ms; its lossy samples are 4045/3218/5297, all retained. Original baseline
|
||||||
|
WebKit cold wire is 1,179,624 bytes. Final LTE/lossy wire is 983,326/990,152 bytes
|
||||||
|
(16.6%/16.1% lower). The final cold set transfers app.js once in both engines.
|
||||||
|
|
||||||
|
|
||||||
|
## Complete final comparison
|
||||||
|
|
||||||
|
Five-run medians. Each cell is Phase 5 → Phase 6; bytes are exact body wire bytes.
|
||||||
|
|
||||||
|
| Browser/profile | Cold requests | Cold bytes | FCP ms | LCP ms | Boot ms | Long tasks ms |
|
||||||
|
|---|---:|---:|---:|---:|---:|---:|
|
||||||
|
| chromium/lte | 115 → 115 | 651012 → 653267 | 1356 → 1388 | 1356 → 1388 | 7043 → 6478 | 278 → 304 |
|
||||||
|
| chromium/lossy | 115 → 115 | 651096 → 653267 | 2052 → 1976 | 2052 → 1976 | 11342 → 10314 | 295 → 297 |
|
||||||
|
| webkit/lte | 159 → 158 | 1097048 → 983326 | 1739 → 905 | 1810 → 982 | 2315 → 2335 | 0 → 0 |
|
||||||
|
| webkit/lossy | 162 → 161 | 1105402 → 990152 | 4303 → 2748 | 4371 → 2821 | 5573 → 5046 | 0 → 0 |
|
||||||
|
|
||||||
|
WebKit does not expose the Long Tasks API; its zero fields mean unmeasured.
|
||||||
|
|
||||||
|
| Browser/profile | Warm boot ms | Offline boot ms | Offline reload ms | Core update ms/bytes | CSS update ms/bytes | Feature update ms/bytes |
|
||||||
|
|---|---:|---:|---:|---:|---:|---:|
|
||||||
|
| chromium/lte | 410 → 418 | 185 → 188 | 202 → 206 | 745/125795 → 872/126186 | 1380/35363 → 1388/35760 | 1378/33408 → 1392/33762 |
|
||||||
|
| chromium/lossy | 403 → 442 | 189 → 194 | 204 → 207 | 747/125795 → 805/126186 | 1377/35363 → 1383/35760 | 1375/33408 → 1386/33762 |
|
||||||
|
| webkit/lte | 83 → 88 | 86 → 88 | 100 → 102 | 1890/147259 → 2015/147626 | 1455/45659 → 1467/46254 | 1455/43318 → 1380/41860 |
|
||||||
|
| webkit/lossy | 85 → 89 | 81 → 85 | 95 → 98 | 4192/147259 → 2934/147626 | 3647/43705 → 3687/44211 | 3644/41364 → 3693/41860 |
|
||||||
|
|
||||||
|
## Limits and exact unmet parity targets
|
||||||
|
|
||||||
|
Strict zero regression versus the recorded Phase 5 run is NOT achieved.
|
||||||
|
Chromium/LTE FCP is 1388 versus 1356 ms (+32); cold bytes 653267 versus 651012
|
||||||
|
(+2255, 0.35%); long tasks 304 versus 278 ms. The verified loader, CSP permission,
|
||||||
|
contract checks and metadata add code/bytes; parser insertion also changes task
|
||||||
|
boundaries. The whole timing delta has not been causally isolated. Three-run
|
||||||
|
contemporary Phase 5 LTE medians were FCP 1368, boot 7090 and long tasks 294 ms.
|
||||||
|
Final Chrome boot improves to 6478/10314 ms (Phase 5 7043/11342).
|
||||||
|
|
||||||
|
Warm/offline/update deltas in the complete table remain explicit. Contemporary
|
||||||
|
five-run Phase 5 warm boots were Chrome 426/446 and WebKit 88/88 ms; final values
|
||||||
|
418/442 and 88/89 ms. Contemporary Phase 5 core-update times were Chrome 869/799
|
||||||
|
and WebKit 1955/2776 ms; final 872/805 and 2015/2934 ms. Metadata adds roughly
|
||||||
|
0.4 KB to core updates. Periodic lossy stalls depend on request order; timing
|
||||||
|
comparisons cannot establish exact parity. The extra CPU/cache work is small,
|
||||||
|
but zero cost was not proved, and the positive timing deltas are not dismissed.
|
||||||
|
|
||||||
|
Every final update passed assertChangedAssets: only app.js, theme-glass.css or
|
||||||
|
presenter.js is downloaded as application code, with index/API/worker metadata;
|
||||||
|
fonts/icons are not re-downloaded. Whole CSS-update wire remains above 30 KB,
|
||||||
|
a pre-existing Phase 5 gap. Readiness and completion remain separately measured.
|
||||||
|
|
||||||
|
Real iPhone Safari/PWA code-cache behavior, OPFS quota pressure, forced cache
|
||||||
|
eviction and uninterrupted locked-screen/background audio for 30 minutes were
|
||||||
|
not verified. The historical media fixture is invalid for autoplay: these are
|
||||||
|
home-launch metrics, not media-start measurements. No playback code changed.
|
||||||
|
Other selected layouts may prefetch 4079 unused classic CSS bytes; that preload
|
||||||
|
never applies, and the selected stylesheet retains its original cascade order.
|
||||||
|
|
||||||
|
## Compatibility verification on the final product
|
||||||
|
|
||||||
|
All commands below ran on 4b1f520, build 31617662d2f0:
|
||||||
|
|
||||||
|
```sh
|
||||||
|
node perf/migration.mjs --browser all --profile unthrottled --out perf/results/phase6-migration-unthrottled-2026-10-08.json
|
||||||
|
node perf/migration.mjs --browser all --profile lossy --out perf/results/phase6-migration-lossy-2026-10-08.json
|
||||||
|
node perf/hidden-timers.mjs
|
||||||
|
node perf/lazy.mjs --browser all --out perf/results/phase6-lazy-2026-10-08.json
|
||||||
|
node perf/seams.mjs --browser all
|
||||||
|
ASSET_SYNC=0 node perf/baseline.mjs --runs 1 --browser all --profile lte --scenario offline --out perf/results/phase6-sync-rollback-2026-10-08.json
|
||||||
|
ASSET_HASHING=0 node perf/baseline.mjs --runs 1 --browser all --profile lte --scenario offline --out perf/results/phase6-hashing-rollback-2026-10-08.json
|
||||||
|
node --test frontend/*.test.js
|
||||||
|
node --test perf/measurement.test.mjs
|
||||||
|
(cd server && bun install && PATH="$PWD/../perf/.tmp/test-venv/bin:$PATH" bun run test)
|
||||||
|
```
|
||||||
|
|
||||||
|
Actual output excerpts:
|
||||||
|
|
||||||
|
```text
|
||||||
|
Migration unthrottled: chromium banners=1 updateReloads=1 cachedFiles=122 userInitiatedOnly=true offline=true playbackGuard=true evictionRepair=true
|
||||||
|
Migration unthrottled: webkit banners=1 updateReloads=1 cachedFiles=122 userInitiatedOnly=true offline=true playbackGuard=true evictionRepair=true
|
||||||
|
Migration lossy: chromium durationMs=25233 banners=1 updateReloads=1 legacyURLs=21 userInitiatedOnly=true offline=true
|
||||||
|
Migration lossy: webkit durationMs=22860 banners=1 updateReloads=1 legacyURLs=21 userInitiatedOnly=true offline=true
|
||||||
|
Hidden timers: Page errors: none; Result: ALL ASSERTIONS PASSED
|
||||||
|
Lazy: chromium PASS; webkit PASS
|
||||||
|
Seams: chromium checked=[shell,presenter,remote,party,share,stats] offlineNetworkRequests=0 errors=[]
|
||||||
|
Seams: webkit checked=[shell,presenter,remote,party,share,stats] offlineNetworkRequests=0 errors=[]
|
||||||
|
Frontend: tests 223; pass 223; fail 0; skipped 0
|
||||||
|
Measurement: tests 3; pass 3; fail 0
|
||||||
|
Server: sum of per-file output: 184 pass; 0 fail
|
||||||
|
```
|
||||||
|
|
||||||
|
Both rollback modes launched offline with zero network in Chromium and WebKit.
|
||||||
|
The archived b77938a fixture was rebuilt by the migration script each time.
|
||||||
|
Legacy reload remains user-initiated; its pre-existing Refresh UI timer exception
|
||||||
|
is unchanged. New-page playback guards, old-client readiness, one banner, old
|
||||||
|
plain/?v=oldTag/?__ytpfresh URLs, already-open old tabs and cached offline reload
|
||||||
|
remain covered. Four expected WebKit disconnected API transport errors per
|
||||||
|
migration were recorded and matched to failed API requests; no script errors.
|
||||||
|
The seam harness's historical Phase 4 artifact was restored after saving the
|
||||||
|
new output as phase6-seams-2026-10-08.json.
|
||||||
|
|
||||||
|
Self-review re-read the complete product diff and master §§3.2/3.3/6/6b.
|
||||||
|
No frontend import was added to server code; no original shell file was removed;
|
||||||
|
no auto skipWaiting, live stateful re-evaluation, playback edit, push or deploy.
|
||||||
|
Cache responses are exact-key checked; stale bodies under a new URL are no-store
|
||||||
|
and carry no decoded transport encoding. Core contract 2 blocks loader-free N-1
|
||||||
|
packing, while same-contract app fallback and executed feature pinning remain
|
||||||
|
covered by both-engine smoke. Failed quota writes never delete saved music.
|
||||||
Reference in New Issue
Block a user