Most devs blame React when their UI feels sluggish. But 90% of performance issues come from unnecessary re-renders, not React itself.

Here are the actual culprits:

1) Storing everything in global state (even UI flags). 2) Passing newly created objects/functions every render. 3) Rendering massive lists without virtualization. 4) Fetching + rendering before caching.

Here’s what instantly speeds up most React apps:

1) Use local state as much as possible. 2) Wrap expensive components with React.memo(). 3) Use useCallback / useMemo only for stable references. 4) Virtualize long lists (React Window / Virtuoso). 5) Cache data with TanStack Query instead of manual fetches.

Frontend performance is simply: Render less. Re-render even less.

What’s the biggest performance bottleneck you’ve faced recently? 👇