Cursor
performance
React Components Rerendering Excessively
After Cursor refactored your React component code, components are re-rendering far too frequently, causing performance degradation and jank on the page.
Components that shouldn't re-render are being triggered by parent updates.
Error Messages You Might See
Component re-rendering too frequently
Lag on user input
High CPU usage
Janky scrolling
Common Causes
- Props or state objects recreated on every render (inline object/function creation)
- useCallback or useMemo removed to simplify code, eliminating optimization
- Parent passes new object reference every render even if contents identical
- Incorrect dependency arrays in useEffect (missing dependencies)
- Context consumer re-renders when context value changes (even unrelated)
How to Fix It
Use React DevTools Profiler to identify re-renders. Wrap components with React.memo() for prop comparison. Use useCallback/useMemo for functions/objects passed as props. Check dependency arrays. Split context if some parts change frequently.
Real developers can help you.
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
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Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How do I find unnecessary re-renders?
React DevTools Profiler tab. Highlight updates shows which components re-rendered. Check props/state actually changed.
What's React.memo?
HOC that memoizes component. Re-renders only if props change (shallow comparison). Use for expensive components.