perf: MutationObserver on document.body fires on every DOM mutation
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 52/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- typescript
- Domain
- frontend, performance
Research direction
Start in apps/app/src/components/explainer-cards.tsx around line 141 and inspect how the MutationObserver is attached and how its callback is triggered. Reproduce frequent DOM updates during agent streaming, then verify the observer no longer reacts to unrelated document-wide mutations and that the performance degradation is addressed.
Written by the indexing model from the issue text.
Description
Description
Severity: P2 — Fragility / Performance
In apps/app/src/components/explainer-cards.tsx:141, a MutationObserver is attached to document.body with { childList: true, subtree: true }, which fires on every DOM mutation in the entire app.
Failure mode
Performance degradation on pages with frequent DOM updates (e.g., during agent streaming).
Suggested fix
- Narrow the observer scope: observe only the CopilotKit container element (e.g.,
[data-copilotkit]) instead ofdocument.body - Add a debounce or
requestIdleCallbackto the callback
From self-review finding F06
- Dominant language
- TypeScript
- Stars
- 1.6k
- Forks
- 202
- PR merge metrics
- No merged PRs in 30d
Contributor guide
First steps
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- Open a pull request that references the issue number.
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