Rendering

Deep Dive: Profiling React Performance with the Chrome DevTools Performance Tab # If you’ve been in the React game for a while, you know the feeling. Your application logic is sound, your useMemo hooks are in place, and the React Profiler says your component render times are “reasonable.” Yet, when you open the app on a mid-tier Android device or an older laptop, it feels sluggish. The scroll stutters. The input lags.

It’s 3 AM. You’ve just shipped a feature. The logic is sound, the tests pass, but the UI feels… heavy. Input fields lag by a fraction of a second. Animations stutter on mobile devices. You check your network tab—it’s clean. You check your bundle size—it’s optimized.