Sluggish React App? Debug It with the Profiler! | Reactjs
Want to know exactly what’s slowing down your React app?
You don’t need to guess — the answer is already in your browser.
When your app feels sluggish, use the React DevTools Profiler to find the bottlenecks:
✅ See which components re-render
✅ How long they take
✅ Why they re-rendered
Steps:
1. Open DevTools
2. Go to the Profiler tab
3. Click Record
4. Interact with your app
5. Stop recording — and analyze the re-renders
You’ll often find a component re-rendering dozens of times unnecessarily — just because a parent changed.
Profiling
Guessing.
Start debugging smarter — and speed up your UI the right way.
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