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[BUG] Review panel freezes when expanding large file diffs in app #13297
Description
Description
In the web/desktop app review panel, files with large diffs (500+ changed lines) are auto-expanded when opening the panel. This causes the UI to freeze or become very laggy because thousands of diff lines are rendered at once.
The current logic in packages/ui/src/components/session-review.tsx only checks file count (>10 files → collapse all), but ignores individual file diff size. A single file with 2000+ changed lines can freeze the entire review panel.
Plugins
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OpenCode version
No response
Steps to reproduce
- Start a session that modifies a large file (500+ line changes)
- Open the review panel (right side panel)
- Observe the UI freezes while rendering the large diff
Screenshot and/or share link
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Operating System
macOS / any
Terminal
No response
Activity
perf(ui): collapse large diffs in review panel to prevent UI freeze
[-]perf(ui): review panel freezes when expanding large file diffs[/-][+][BUG] Review panel freezes when expanding large file diffs in app[/+]neriousy commentedon Feb 13, 2026
Fixed in #13460
github-actions commentedon Apr 15, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.