Performance Optimization in React Native

Performance optimization in React Native is crucial to deliver a smooth user experience. It involves various strategies to improve the app's responsiveness, loading times, and overall efficiency.

2.1 React Native Architecture

Understanding the architecture is vital. React Native bridges native components with JavaScript, allowing for high performance and a seamless user experience.

2.2 Virtual DOM

React Native uses a Virtual DOM to optimize rendering. It minimizes the number of direct manipulations to the actual DOM, which can be costly in terms of performance.

3.1 Optimize Images

Use appropriately sized images and leverage formats like JPEG or WebP for better compression.

3.2 Use PureComponent and memo

Use React.PureComponent or React.memo to prevent unnecessary re-renders.

{`
import React, { memo } from 'react';

const MyComponent = memo(({ prop }) => {
    return {prop};
});
`}
            

3.3 Use FlatList for Large Datasets

When dealing with large lists, use FlatList instead of ScrollView to improve performance.

{`
 item.id}
    renderItem={({ item }) => }
/>
`}
            

3.4 Reduce Overdraw

Minimize the number of overlapping views to reduce overdraw, which can cause performance issues.

3.5 Use InteractionManager

To defer non-urgent tasks until after animations, use InteractionManager.runAfterInteractions.

{`
InteractionManager.runAfterInteractions(() => {
    // Your code here
});
`}