Memoization

Summary

Using `useMemo`/`useCallback`/`React.memo` (or non-React memoization) to skip expensive recalculations and re-renders — a targeted performance tool, not a default habit.

• 1Profile a component with React DevTools before adding any memoization.
• 2Add memoization only where the profiler shows an actual cost.
• 3Learn that overusing memoization can add complexity without measurable benefit.