Cursor
performance
Memory Leak After Cursor Refactored Cleanup Code
Your application has developed a memory leak after Cursor refactored cleanup code. Memory usage increases over time and never decreases, eventually causing crashes or slowdowns.
Event listeners or subscriptions are not being properly cleaned up.
Error Messages You Might See
Out of memory
Heap size exceeded
Memory usage increasing
Process killed
Common Causes
- useEffect cleanup function removed or broken
- Event listener added but never removed (addEventListener without removeEventListener)
- Subscription created but not unsubscribed (Observable)
- Timers (setInterval/setTimeout) not cleared
- References held to DOM nodes preventing garbage collection
How to Fix It
useEffect cleanup returns function: useEffect(() => { return () => cleanup; }, []). Remove listeners: window.removeEventListener('scroll', handler). Clear timers: clearInterval(id). Unsubscribe: subscription.unsubscribe(). Use Chrome DevTools Memory tab to detect leaks.
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Get HelpFrequently Asked Questions
How do I detect memory leaks?
Chrome DevTools Memory tab. Take heap snapshots. Compare before/after action. Look for growing detached DOM nodes.
What's a WeakMap?
Map that holds weak references. Allows garbage collection if key is no longer referenced elsewhere. Useful for metadata on objects.