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perf(ui): cap pane animations at 30 fps - #1036
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Greptile SummaryThis PR caps intermediate pane-layout presentation at 30 FPS while retaining wall-clock timeline progress and an unconditional final-layout commit.
Confidence Score: 4/5The implementation appears behaviorally sound, but the repository's runtime-testing requirement must be satisfied with integration coverage before merging. The throttle resets for each transition and completion commits the exact target layout, but the only new test validates helper arithmetic while test-mode animations bypass the modified callback path. Files Needing Attention: packages/hunk/src/ui/hooks/usePaneSlideAnimation.ts, packages/hunk/src/ui/lib/paneSlide.test.ts Important Files Changed
Flowchart%%{init: {'theme': 'neutral'}}%%
flowchart TD
T[Timeline update] --> D{Frame interval elapsed?}
D -->|No| S[Skip intermediate commit]
D -->|Yes| I[Interpolate pane geometry]
I --> C[Commit presented layout]
S --> N[Next timeline callback]
C --> N
N --> F{Timeline complete?}
F -->|No| T
F -->|Yes| E[Commit exact destination layout]
Prompt To Fix All With AI### Issue 1
packages/hunk/src/ui/lib/paneSlide.test.ts:63-69
**Animation path remains untested**
This test checks only the frame-interval calculation. The runtime change also alters timeline callback throttling, timestamp resets, and the final-layout commit, but test mode sets animation duration to zero, so existing application tests bypass that path. The repository requires tests for modified runtime behavior, so this must be covered before merging with a controllable nonzero-duration timeline that verifies both the 30 FPS cap and the exact final layout.
---
For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.Reviews (1): Last reviewed commit: "perf(ui): cap pane animations at 30 fps" | Re-trigger Greptile |
![greptile-apps[bot]](https://avatars.githubusercontent.com/in/867647?s=60&v=4){kind=small}
| test("caps presentation commits at the configured frame rate", () => { | ||
| const frameInterval = 1_000 / PANE_SLIDE_MAX_FPS; | ||
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| expect(paneSlideFrameDue(Number.NEGATIVE_INFINITY, 0)).toBe(true); | ||
| expect(paneSlideFrameDue(100, 100 + frameInterval - 0.01)).toBe(false); | ||
| expect(paneSlideFrameDue(100, 100 + frameInterval)).toBe(true); | ||
| }); |
There was a problem hiding this comment.
This test checks only the frame-interval calculation. The runtime change also alters timeline callback throttling, timestamp resets, and the final-layout commit, but test mode sets animation duration to zero, so existing application tests bypass that path. The repository requires tests for modified runtime behavior, so this must be covered before merging with a controllable nonzero-duration timeline that verifies both the 30 FPS cap and the exact final layout.
Context Used: guidelines.mdc Cursor rule (source)
Prompt To Fix With AI
This is a comment left during a code review.
Path: packages/hunk/src/ui/lib/paneSlide.test.ts
Line: 63-69
Comment:
**Animation path remains untested**
This test checks only the frame-interval calculation. The runtime change also alters timeline callback throttling, timestamp resets, and the final-layout commit, but test mode sets animation duration to zero, so existing application tests bypass that path. The repository requires tests for modified runtime behavior, so this must be covered before merging with a controllable nonzero-duration timeline that verifies both the 30 FPS cap and the exact final layout.
**Context Used:** guidelines.mdc Cursor rule ([source](https://github.com/modem-dev/modem/blob/main/.cursor/rules/guidelines.mdc))
---
For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
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1 participant
Summary
Why
OpenTUI can drive timeline callbacks near 200 FPS. Pane animation geometry changes can rerender and reflow the review, so presenting every callback creates avoidable transient CPU work without useful terminal output.
Benchmark
One warmed local sample using Bun 1.4.2, a 240x28 viewport, and a synthetic 30-file review:
The cap reduced sampled animation CPU by about 25% while closing and 33% while opening. Open-transition p95 render time fell from 25.22 ms to 14.66 ms.
Verification
bun run typecheckbun run lint -- packages/hunk/src/ui/hooks/usePaneSlideAnimation.ts packages/hunk/src/ui/lib/paneSlide.ts packages/hunk/src/ui/lib/paneSlide.test.tsbun test packages/hunk/src/ui/lib/paneSlide.test.ts packages/hunk/src/ui/AppHost.interactions.test.tsx packages/hunk/src/ui/AppHost.sidebar-visibility.test.tsx packages/hunk/src/ui/AppHost.responsive.test.tsx packages/hunk/src/ui/AppHost.review-metadata.test.tsx(103 pass)bun run test:integration(155 pass, 1 skip)bun run test:tty-smoke(9 pass)bun run testreached 4,005 passes; two unrelated temporary-path isolation tests fail locally because an existing/tmp/node_modules/hunkdiffcheckout is discovered from their fixtures.