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React Native Performance Tips I Wish I Knew Earlier
Quick tips and tricks for improving React Native app performance based on real-world experience.
2024-08-10
react-nativeperformancemobileoptimization
# React Native Performance Tips I Wish I Knew Earlier
After building several React Native apps, I've learned some performance optimization techniques that can make a significant difference. Here are the key tips that helped me improve app performance.
## 1. Use React.memo Wisely
Don't wrap every component in `React.memo`. Only use it for components that:
- Receive stable props
- Render expensive content
- Are re-rendered frequently
```typescript
// Good use case
const ExpensiveChart = React.memo(({ data, config }) => {
// Expensive chart rendering
return {text} ;
});
```
## 2. Optimize FlatList Rendering
FlatList is often a performance bottleneck. Here are the key optimizations:
```typescript
const OptimizedFlatList = () => {
const renderItem = useCallback(({ item }) => (
// Good - stable references
const styles = StyleSheet.create({
container: {
backgroundColor: 'red',
padding: 10,
},
});
const handlePress = useCallback(() => {
// handle press logic
}, []);
```
## 4. Use InteractionManager for Heavy Operations
Defer heavy operations until after animations complete:
```typescript
const handleHeavyOperation = () => {
InteractionManager.runAfterInteractions(() => {
// Heavy operation here
processLargeDataset();
});
};
```
## 5. Optimize Image Loading
Images can significantly impact performance:
```typescript
// Use appropriate image sizes
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