If you're building a React app and it already feels slow - you're not alone.

A lot of early-stage teams and beginner devs run into performance issues without realizing why. And no, it’s not because React is bad. It’s usually about how it’s being used.

Let’s break down some common causes of slow React apps, and how to fix them without getting overwhelmed.

1. Too Many Renders:
React re-renders components when state or props change. If you’re updating state too often (especially in parent components), you’ll trigger unnecessary re-renders all over the place.

Fix: Use React.memo, useMemo, or useCallback wisely. Also, keep your components small so re-renders are easier to control.

2. Loading Everything at Once:
Fetching a bunch of data on initial load or loading large libraries you don’t need right away can slow things down, especially on mobile.

Fix: Use lazy loading and React.lazy() for components. Split your code. Load what you need, when you need it.

3. Bad State Management:
Lifting state too high or using useState for everything can create performance headaches.

Fix: Try local state where possible, and consider lightweight tools like Zustand or Jotai instead of going straight to Redux for small projects.

4. Not Using Keys Correctly:
Ever seen weird behavior in lists? It might be because you're not using stable key props in .map().

Fix: Always use unique, stable keys, not array indexes, when rendering lists. It helps React track changes efficiently.

5. Ignoring Mobile Performance:
If you're only testing your app on a MacBook Pro with 32GB RAM, you're gonna miss a lot.

Fix: Test your app on slower devices or in throttled network mode in DevTools. You'll spot bottlenecks faster. The more - the better.

Keep It Simple
Many slow apps don’t need “optimization” — they need cleanup. Remove unused dependencies, trim your component tree, and don’t overengineer.

Final Thought
React is fast, but only if you don’t accidentally slow it down. Most of the fixes above aren’t complex - they just need awareness.

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