React Re-rendering Causing Performance Issues - Slow Interactions
Your app feels sluggish when interacting. Typing in inputs lags, clicking buttons is unresponsive. React is re-rendering too much.
Frame rate drops during interactions or when state updates happen.
Error Messages You Might See
Common Causes
- Parent component re-rendering, causing all children to re-render unnecessarily
- Heavy computations happening during render
- State updates too frequently or on every keystroke without debounce
- Missing useMemo or useCallback, causing child components to re-render
- Large lists rendering all items instead of virtualizing
How to Fix It
Use React DevTools Profiler to identify slow components
Memoize expensive computations: useMemo(() => expensiveCalc(data), [data])
Memoize callbacks: useCallback(fn, deps) to prevent child re-renders
Use React.memo for components that receive same props
Debounce input: useDebounce(value, 300) for search/filters
Virtualize long lists: react-window or react-virtualized
Real developers can help you.
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
Jen Jacobsen
I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses.
I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain.
Victor Denisov
Developer
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
AUXLE
I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies.
BurnHavoc
Been around fixing other peoples code for 20 years.
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 know if component is re-rendering too much?
React DevTools Profiler - record interaction, see render counts. Add console.log to component
Should I memoize everything?
No, adds overhead. Only memoize expensive calculations or passed-to-children functions
What's the difference between useMemo and useCallback?
useMemo caches computed value. useCallback caches function reference. Both prevent unnecessary re-renders of children