How does code splitting help React performance?
It keeps the initial bundle small. Split large routes with React.lazy and Suspense so users load code on demand, which improves the first load significantly instead of shipping the entire app upfront.
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More FAQs in React Performance Optimization Techniques That Actually Matter
Measure before optimizing. Do not guess what is slow. Use the React DevTools Profiler to find which components are slow or re-render too much, then optimize those specifically.
When a component does expensive computation on every render. Wrapping that computation in useMemo means it only recomputes when its dependencies change. This is one of the few memoization cases that clearly helps.
Stabilize prop references. If a parent passes new object or function references on every render, children re-render even if nothing changed. Use useMemo and useCallback to stabilize references, or pass primitive props where possible.
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