Profiling with React DevTools
The React Profiler helps identify components that render, how long rendering takes, and which interactions cause work. Use it to establish a baseline before changing code.
A useful investigation asks: Which component rendered? Why did it render? How expensive was it? Did the render cause expensive DOM work? Is the user-visible latency actually coming from React?
Avoid optimizing a component simply because it appears in a profiler trace. The goal is meaningful user-facing improvement.
Key Takeaways
- Profile representative user interactions.
- Look for expensive work and unnecessary propagation.
- Validate that an optimization improves the real interaction.