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2c867b05ce
Driving HER real instance (real profile, real transcripts, streams live)
via CDP instead of synthetic tiles finally exposed the remaining stall.
The timeline on a real 60-frame sash drag:
style recalc 2736ms | script 1027ms | layout 89ms
top callsite: pin @ fallback.tsx — 927ms
Two pin-to-bottom ResizeObservers (the bounded tool window's and the
reasoning preview's) pinned on EVERY resize delivery. A sash drag changes
every message's WIDTH once per frame, so each frame ran scrollTop write ->
scrollHeight read across every tool group: a forced write-read reflow
cascade that the render counters could never see (zero React involvement).
Both pins are now height-gated off the RO entry (reflow-free): only
content GROWTH pins. Width-only deliveries return immediately.
Measured on the live app, same drag, before -> after:
fps 11.5 -> 59-60
p95 101ms -> 18ms
slow>33 60/60 -> 1/60
Also in this batch (each was verified live before the next was attempted):
- thread/list: split messageSignature into STRUCTURAL (ids/roles — keys
boundaries + row identity) and WEIGHT (part counts — budget only), and
memoize groups + row JSX. A streamed part-append re-rendered every
turn's boundary via its resetKey prop; explain() measured 540-865
wasted Block renders per drag/stream sample, now {}.
- message-render-boundary: document the structural-only resetKey contract.
- tool/fallback: memoize ToolFallback's part object + ToolEntry/ToolTitle/
ToolGlyph (151 renders each, 100% wasted, on real transcripts).
- use-message-stream: ADAPTIVE flush floor — next flush waits 3x the
measured cost of the last one (33ms floor, 250ms cap), so multi-stream
load degrades text update rate instead of input latency.
- tree-split: preview sash drags with inline flex on the two seam
wrappers, committing the store ONCE on release (fixed-zone sides get
flexBasis only, so a hidden sidebar can't leave a phantom gap).
- debug/: perf-live LoAF long-frame attribution, explain() cascade walker
with changed-hook indices, diag-real-loop/key-latency/switch-trace
probes that drive the real app over CDP.
Typing during 2 live streams: keystroke->paint p50 3.3ms, p95 18.4ms,
zero frames over 33ms. Session switch p50 ~35ms settled; the remaining
~1.3s outlier tail is streaming-session switches (React work-loop, not
style/layout) — next target.
25 lines
1.1 KiB
JavaScript
25 lines
1.1 KiB
JavaScript
// Is the tree-split preview path actually active in the running renderer?
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// Checks the served source (what vite compiled) rather than guessing.
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import { attach } from './perf/lib/launch.mjs'
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const { cdp, teardown } = await attach({ port: 9222 })
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try {
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await cdp.send('Runtime.enable')
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const out = await cdp.eval(`(async () => {
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const res = await fetch('/src/components/pane-shell/tree/renderer/tree-split.tsx')
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const src = await res.text()
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return JSON.stringify({
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previewShift: src.includes('previewShift'),
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adaptiveFloor: (await (await fetch('/src/app/session/hooks/use-message-stream/index.ts')).text()).includes('adaptiveFloor'),
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structuralSignature: (await (await fetch('/src/components/assistant-ui/thread/list.tsx')).text()).includes('structuralSignature'),
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sharedRO: (await (await fetch('/src/hooks/use-resize-observer.ts')).text()).includes('sharedObserver'),
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rootTipProvider: (await (await fetch('/src/main.tsx')).text()).includes('RootTooltipProvider')
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})
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})()`)
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console.log(out)
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} finally {
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teardown?.()
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}
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