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