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4798994dce
Adds an `idle-cost` scenario for the symptom Brooklyn reported: with a thread spinning, resizing the sidebar feels slow. It holds N tiles busy, pushes NO tokens, and measures the renderer's self-inflicted commit rate plus fps while dragging the splitter and while typing. It reproduces immediately. Five busy tiles, nothing streaming: idle commits 17.7/sec (should be 0 — nothing is happening) drag 1.4 fps p95 812ms, worst frame 1.9s typing 61 fps (fine — this is specific to resize) Attributing the drag window showed 105,385 TooltipProvider renders and ~15s of component time across a 60-frame gesture. Cause: `Tip` mounts a full Radix provider + Tooltip per call site, and there are ~107 of them. Radix's Tooltip holds real state and Popper subscribes to layout, so an unrelated interaction re-rendered all of them. Mounts the machinery lazily instead, on first hover/focus. Tooltip churn drops ~4x (105k -> 26k) and drag doubles to 3fps. Note `defaultOpen` on the armed Tooltip is load-bearing: the pointerenter that armed it has already fired, so Radix never sees it and the tip mounts silently closed. A test caught exactly that, and now guards it. 3fps is still bad — the remaining cost is the whole transcript re-rendering per resize frame (MessagePrimitive.Parts 12,600 renders / 10.5s, Block/Ct 24,300 each, all 100% wasted). Separate fix. |
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| .. | ||
| 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-jump.mjs | ||
| diag-scroll-reset.mjs | ||
| eval.mjs | ||
| gen-share-codes.ts | ||
| 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 | ||