perf(renderer): reduce virtualized selection scroll churn by JustYannicc · Pull Request #604 · SuperCmdLabs/SuperCmd

JustYannicc · 2026-07-05T01:59:22Z

What changed

Changed Raycast Grid virtual selection correction from smooth scrolling to instant behavior: 'auto'.
Changed LauncherCommandList virtual selected-row correction from smooth scrolling to instant behavior: 'auto'.
Added scripts/test-virtual-selection-scroll-behavior.mjs to assert the selected virtual scroll paths do not reintroduce smooth scroll animations.

Why

Held arrow navigation can update selection faster than smooth scrolling animations complete. The List runtime already uses instant scroll for this reason; matching that behavior in Grid and Launcher avoids queued browser animations and the resulting retained animation/jank risk while preserving the same selected-item viewport math.

Compatibility impact

Selection semantics, virtual window inclusion, refs, focus handling, accessibility attributes, and scroll target math are unchanged. The only user-visible difference is that keyboard-driven selected-item auto-scroll correction is instant instead of animated in these virtualized surfaces.

How tested

node --test scripts/test-virtual-selection-scroll-behavior.mjs scripts/test-grid-virtualization.mjs scripts/test-launcher-command-list-windowing.mjs
node scripts/run-node-tests.mjs --exclude-perf
./node_modules/.bin/tsc -p tsconfig.renderer.json --noEmit --pretty false
node scripts/check-package-manager-parity.mjs
Codex LSP diagnostics on src/renderer/src/raycast-api/grid-runtime.tsx: no diagnostics found
Codex LSP diagnostics on src/renderer/src/components/LauncherCommandList.tsx: no diagnostics found
Note: npm run typecheck:renderer could not run because npm is intentionally disabled on this Mac; the equivalent renderer tsc command passed directly.

Performance evidence

Audit baseline on codex/perf-wave4-integrated-stack-20260705 at ac90ce403aeddab98d0a1b245afce268c48b8bfd:

node scripts/measure-raycast-grid-render-churn.mjs --iterations=5 --warmups=1 --selection-steps=800 --json: selectionScroll.scrollUpdates=743, median 0.400875ms, p95 2.28325ms; selectionRenderChurn.cellRenderCount=1600, median 354.815833ms, p95 621.91025ms.
node scripts/measure-launcher-command-list-render.mjs --iterations=5 --json: totalRows=122, totalMedianMs=3.494833ms.

Local before on this branch before the patch:

Grid: selectionScroll.scrollUpdates=743, median 0.425208ms, p95 2.916209ms; selectionRenderChurn.cellRenderCount=1600, median 191.135208ms, p95 219.773709ms.
Launcher: totalRows=122, totalMedianMs=4.451667ms.

Local after this patch:

Grid: selectionScroll.scrollUpdates=743, median 0.392667ms, p95 2.594583ms; selectionRenderChurn.cellRenderCount=1600, median 178.294125ms, p95 194.187708ms.
Launcher: totalRows=122, totalMedianMs=3.712958ms.

Structural evidence: both virtualized selected-scroll paths now use behavior: 'auto', and scripts/test-virtual-selection-scroll-behavior.mjs fails if either path switches back to behavior: 'smooth'.

Stack validation

Started from codex/perf-wave4-integrated-stack-20260705 at ac90ce403aeddab98d0a1b245afce268c48b8bfd; verified git rev-parse HEAD returned that exact SHA before creating codex/perf-renderer-virtual-scroll-churn-20260705.

Replaces

Wave5 performance implementation thread. Replaces no prior PR.

(cherry picked from commit 39b567a)

(cherry picked from commit 23ddb55)

(cherry picked from commit 59166b4)

(cherry picked from commit 83c2a89)

(cherry picked from commit 0a7560b)

(cherry picked from commit 17fb535)

… churn

# Conflicts: # src/renderer/src/raycast-api/hooks/use-cached-promise.ts

…launcher surfaces # Conflicts: # src/renderer/src/raycast-api/list-runtime-renderers.tsx # src/renderer/src/raycast-api/list-runtime.tsx

…IO stalls # Conflicts: # src/renderer/src/CameraExtension.tsx

…verhead

…istry churn

… overhead

…nd icon churn

# Conflicts: # src/renderer/src/raycast-api/list-runtime.tsx

…resh overhead # Conflicts: # scripts/bench-script-command-discovery.mjs # scripts/benchmark-file-search-delete-batch.mjs # scripts/lib/script-command-runner-harness.mjs # scripts/lib/ts-import.mjs # scripts/test-file-search-delete-batch.mjs # scripts/test-script-command-runner.mjs # src/main/file-search-index.ts # src/main/main.ts

…hurn # Conflicts: # scripts/lib/script-command-runner-harness.mjs # scripts/lib/ts-import.mjs # scripts/test-extension-lifecycle-sandbox.mjs # scripts/test-script-command-runner.mjs # src/main/main.ts # src/renderer/src/ExtensionView.tsx

… hot paths # Conflicts: # scripts/test-use-frecency-sorting.mjs # src/renderer/src/raycast-api/form-runtime.tsx # src/renderer/src/raycast-api/grid-runtime-hooks.ts # src/renderer/src/raycast-api/grid-runtime-items.tsx # src/renderer/src/raycast-api/hooks/use-frecency-sorting.ts

# Conflicts: # .github/workflows/project-checks.yml # package.json # scripts/file-search-perf-harness.mjs # scripts/test-browser-search-performance.mjs # scripts/test-file-search-perf-harness.mjs # scripts/test-root-search-perf.mjs # src/renderer/src/CameraExtension.tsx # src/renderer/src/hooks/useBrowserSearch.ts # src/renderer/src/raycast-api/list-runtime.tsx

…cle and media fixes # Conflicts: # scripts/lib/ts-import.mjs # scripts/measure-extension-bundle-cache.mjs # src/main/commands.ts # src/main/extension-runner.ts # src/main/main.ts # src/renderer/src/ExtensionView.tsx # src/renderer/src/raycast-api/grid-runtime-hooks.ts # src/renderer/src/raycast-api/list-runtime-hooks.ts

JustYannicc · 2026-07-05T10:22:48Z

Superseded by consolidated renderer/Raycast wave5 PR #621: #621

JustYannicc added 30 commits July 3, 2026 22:19

Batch AI chat stream updates

5ae51b3

Batch cursor prompt stream updates

18481a2

perf(ai): batch Raycast useAI streaming

be66d99

ci: add project regression checks

a1d8c7b

Add bundled TS import helper for tests

a1225c6

fix(types): make renderer typecheck clean

0799e71

ci(claude): fix review action on fork PRs

835bf3a

fix(i18n): restore Italian parity checks

4605c88

fix(pnpm): approve native build scripts

d4c6a9f

perf: cache local icon asset existence checks

986c87a

Virtualize emoji grid list rendering

9e4eed3

Memoize Phosphor icon resolution

5245253

Cache emoji caret session state

cfe2ec3

Stabilize list item registry order

83d6b0b

perf(launcher): window command list rendering

e03ad3e

perf(grid): virtualize grid rendering

f07b554

perf(settings): coalesce AI status polling

6f06eb4

perf(icons): coalesce file icon IPC

949a6fd

Remove root search ranking diagnostics

8ca7ec9

perf: optimize file search delete batches

fb857f2

perf: memoize frecency sorting defaults

dee7108

Avoid interval file-index rebuilds

68cb050

Avoid full script reads for command headers

9f246ce

Optimize root search command scoring

12f951e

perf(runtime): reduce extension and menubar churn

a2737ce

Speed up path-like file search queries

7ed6c2a

Add file search perf harness

dff8539

perf(browser-search): index hot query path

caa78e1

fix(browser-search): narrow indexed nickname candidates

321d103

test: trim benchmark script eof whitespace

644e72d

JustYannicc added 27 commits July 5, 2026 02:26

fix(raycast): guard registry microtask teardown

d89cd33

perf: target extension command refresh

7905622

(cherry picked from commit 39b567a)

fix: clean up extension spawn lifecycle

977dd98

(cherry picked from commit 23ddb55)

Fix extension fetch proxy cancellation

ce93d8d

(cherry picked from commit 59166b4)

fix: clean up main abort listeners

c448044

(cherry picked from commit 83c2a89)

perf: stream cloud media buffers

a5e7148

(cherry picked from commit 0a7560b)

fix(renderer): validate Raycast wave4 consolidation

a18e78b

fix(raycast): guard registry microtask teardown

aac9a64

(cherry picked from commit 17fb535)

fix(validation): finish consolidated checks

0635377

fix: align runtime consolidation integration

b4e5dab

Merge PR SuperCmdLabs#530 perf(runtime): reduce extension and menubar…

0fb756d

… churn

Merge PR SuperCmdLabs#531 perf(ai): batch streaming and status updates

01eab4b

Merge PR SuperCmdLabs#532 fix(validation): restore project checks

38fe371

# Conflicts: # src/renderer/src/raycast-api/hooks/use-cached-promise.ts

Merge PR SuperCmdLabs#533 perf(renderer): cache icons and virtualize …

1adbb01

…launcher surfaces # Conflicts: # src/renderer/src/raycast-api/list-runtime-renderers.tsx # src/renderer/src/raycast-api/list-runtime.tsx

Merge PR SuperCmdLabs#534 perf(mac): reduce native polling and async …

81814e6

…IO stalls # Conflicts: # src/renderer/src/CameraExtension.tsx

Merge PR SuperCmdLabs#535 perf(search): reduce indexing and ranking o…

b34c6fb

…verhead

Merge PR SuperCmdLabs#555 perf(raycast): reduce renderer hook and reg…

bef5071

…istry churn

Merge PR SuperCmdLabs#556 perf(ai): reduce streaming and native media…

36d7f28

… overhead

Merge PR SuperCmdLabs#558 perf(runtime): reduce extension lifecycle a…

d3e0bcc

…nd icon churn

Merge PR SuperCmdLabs#572 perf(renderer): reduce UI runtime churn

6da8e78

# Conflicts: # src/renderer/src/raycast-api/list-runtime.tsx

chore: finalize performance integration stack

ac90ce4

perf(renderer): reduce virtualized selection scroll churn

2800f9d

JustYannicc mentioned this pull request Jul 5, 2026

perf(renderer): consolidate Raycast UI hot paths #621

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JustYannicc closed this Jul 5, 2026

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perf(renderer): reduce virtualized selection scroll churn - #604

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JustYannicc commented Jul 5, 2026

What changed

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