Performance Engineering, Profiling, and Virtualization

High-scale frontend applications require rigorous performance engineering. Interviewers want to see that you measure before optimizing, rather than blindly sprinkling useMemo across your codebase.

Learn how component composition patterns eliminate re-renders without memoization, implement list virtualization for tens of thousands of items using mathematical windowing, and diagnose performance bottlenecks using the React DevTools Profiler flamegraph.