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Desktop app renderer freezes/crashes repeatedly #31594
Description
Description
Desktop app renderer freezes/crashes repeatedly when rendering code diffs in chat. The execEditLength function in the diff algorithm hangs on large inputs, making the UI unresponsive for 5-10 seconds (or permanently) each time a code diff is displayed.
Plugins
No response
OpenCode version
OpenCode version
Steps to reproduce
Open OpenCode Desktop app (macOS arm64)
Start a new session / conversation
Ask the agent to make code edits that produce large diffs (or continue the conversation long enough to accumulate multiple diffs)
Observe the app freeze — the renderer becomes unresponsive
Restart the app — it tries to restore the previous session and freezes again immediately
Screenshot and/or share link
From ~/Library/Application Support/ai.opencode.desktop/logs/*/window.log:
[error] (window) renderer unresponsive
at execEditLength (main-CMia5thD.js:42291:7)
at LineDiff.diffWithOptionsObj (main-CMia5thD.js:42340:21)
at diffLines (main-CMia5thD.js:42491:19)
at structuredPatch (main-CMia5thD.js:42529:35)
at createTwoFilesPatch (main-CMia5thD.js:42656:22)
at parseDiffFromFile (main-CMia5thD.js:44283:32)
at fileDiffFromContent (session-kFpN98Pe.js:18980:10)
at fileDiffFromPatch (session-kFpN98Pe.js:18914:28)
at resolveFileDiff (session-kFpN98Pe.js:18884:47)
Operating System
macOS (Apple Silicon)
Terminal
N/A (Desktop app)
Activity
github-actions commentedon Jun 10, 2026
This issue might be a duplicate of existing issues. Please check:
execEditLengthstack trace, Windows)execEditLength→structuredPatchcall chain)These issues describe the same root cause: synchronous Myers diff computation (
execEditLength) blocking the Electron renderer thread when processing large diffs.github-actions commentedon Aug 9, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.