Optimizing React Apps for Speed

Modern users abandon slow sites in seconds, so performance is a product feature. React provides granular hooks—`memo`, `useMemo`, `useCallback`—that help skip needless renders. Combined with dynamic import–based code‑splitting, tree‑shaking, and image optimization, bundle size drops dramatically. Virtualization libraries such as `react‑window` paint thousands of rows without jank, while service workers keep assets local for offline resilience. Measurement remains key: the React Profiler, Lighthouse, and Web Vitals reveal where to focus effort and verify that each change genuinely moves the performance needle.