A Practical React Performance Checklist

Most React performance problems aren't about React being slow — they're about doing too much work on every render. This is the checklist I run through.

Measure before you optimize

Open the React Profiler and find what actually re-renders. Guessing wastes time; the flame graph never lies.

Split and lazy-load

Lazy-load routes and heavy components with dynamic imports so the initial bundle stays small and Time-to-Interactive drops.