Taming React re-renders without overusing memo

Many React performance issues come from unnecessary re-renders — but the fix is not to memoize everything.

# Understand the cause first

A component re-renders when its state, props, or context change. Measure with the React DevTools Profiler before optimizing.

# Memoize where it counts

useMemo and React.memo help with expensive computations or large lists, but scattering them adds complexity for no gain.

• Move state closer to where it's used
• Split components to isolate render zones
• Only memoize once you've measured the win

Optimize based on numbers, not on gut feeling.