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React Native Performance Optimization Guide
If your app feels slow, stutters on scroll, or burns time during startup, this guide gives you a practical checklist for fixing the biggest React Native performance bottlenecks without rewriting the whole app.
Fix list rendering
Large lists are usually the fastest win: use virtualization, stable keys, and smaller row components.
Reduce expensive work
Move heavy transforms out of render, memoize only when it matters, and keep state local.
What usually slows React Native apps down
- Over-rendering because too much state lives in one component tree.
- Huge lists without proper virtualization or item separation.
- Large images, heavy animations, or expensive startup logic on the main path.
- Network calls, transforms, or storage reads happening during initial render.
- Native module issues that are hidden until production traffic grows.
Practical fixes that usually work
- Measure first with profiler tools and in-app timing logs.
- Keep screen-level components small and push state down where possible.
- Split list rows into independent components and keep props stable.
- Compress and resize images before shipping them to the device.
- Defer expensive work until after the first paint or interaction.
- Check whether a native implementation is needed for the hottest code path.
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Related pages
FAQ
Should I use memo everywhere?
No. Memoization helps only when a component rerenders often and the render is actually expensive.
Is Expo bad for performance?
No. Expo can be fast and productive. The real question is whether the app architecture fits the workload.
When should I go native?
Go native when a hotspot remains slow after the normal React Native fixes and the product justifies the added complexity.