81779fa6a0
Switching to a STREAMING session took ~1.4s to settle while an idle
session settled in ~50ms. The autopsy probe named it: the
FIRST_PAINT_BUDGET -> RENDER_BUDGET backfill runs as a transition, an
interrupted transition restarts from scratch, and stream flushes land
every 33-250ms — so the 300-part backfill re-rendered over and over
(measured: 1374ms settle, 30 commits, Primitive.div x2237 for one switch).
Gate the backfill on the thread being idle. The user lands on the live
tail immediately either way; older turns backfill the moment the run
ends, and 'Show earlier' remains the manual path meanwhile.
Measured on the live app (diag-switch-autopsy, real sessions):
switch to idle session ~35-55ms settled (unchanged)
switch to streaming session 1374ms -> backfill deferred; lands at
the live tail like any other switch
Adds diag-switch-autopsy.mjs (per-switch settle/commits/top-renders) and
live-drive.mjs (status/fps/drag one-liners against the running app).
|
||
|---|---|---|
| .. | ||
| perf | ||
| .gitignore | ||
| after-pack.mjs | ||
| assert-dist-built.mjs | ||
| assert-dist-built.test.mjs | ||
| assert-root-install.mjs | ||
| before-build.mjs | ||
| before-pack.mjs | ||
| before-pack.test.mjs | ||
| bundle-electron-main.mjs | ||
| click-session.mjs | ||
| dev-mock.mjs | ||
| dev-no-hmr.mjs | ||
| diag-code-live.mjs | ||
| diag-drag-churn.mjs | ||
| diag-drag-trace.mjs | ||
| diag-jump.mjs | ||
| diag-key-latency.mjs | ||
| diag-live-state.mjs | ||
| diag-real-loop.mjs | ||
| diag-ro-storm.mjs | ||
| diag-scroll-reset.mjs | ||
| diag-sidebar-dom.mjs | ||
| diag-switch-autopsy.mjs | ||
| diag-switch-trace.mjs | ||
| eval.mjs | ||
| gen-share-codes.ts | ||
| live-drive.mjs | ||
| notarize-artifact.mjs | ||
| notarize.mjs | ||
| patch-electron-builder-mac-binary.mjs | ||
| probe-model-picker.mjs | ||
| probe-renderer.mjs | ||
| probe-thread.mjs | ||
| profile-model-picker.mjs | ||
| profile-typing-lag.md | ||
| rebuild-native.mjs | ||
| reload-renderer.mjs | ||
| reload.mjs | ||
| run-electron-builder.mjs | ||
| set-exe-identity.mjs | ||
| stage-native-deps.mjs | ||
| stage-native-deps.test.mjs | ||
| test-desktop.mjs | ||
| utils.mjs | ||
| write-build-stamp.mjs | ||
| write-build-stamp.test.mjs | ||