As React apps grow, you may notice performance starting to lag - sluggish interactions, choppy animations, janky scrolling.
Luckily, there are many great techniques to optimize React app performance. Let’s look at some top tips:
Use React.memo for Component Memoization
React.memo API can memoize component outputs:
This prevents unnecessary re-renders if props stay the same.
Virtualize Long Lists
Rendering thousands of rows kills performance. Virtualize rendering instead:
Only items visible on-screen are rendered.
Avoid Reconciliation with Keys
Keys help React distinguish elements from previous renders:
Mismatching keys lead to full reconciliation.
Split Code with React.lazy
React.lazy allows code splitting components into separate bundles:
Lazy loading avoids loading unnecessary code until needed.
Use useCallback Hooks
Wrap event handlers in
useCallback to avoid regenerating functions:
Avoids re-renders from new event handlers on each call.
- Memoize components with
- Virtualize long lists
- Ensure keys are stable
- Code split with
With some optimization, React can render complex UIs faster than ever.