Flutter Performance Tips

After working on apps with millions of users, here are performance tips that actually make a difference.

1. Use const Constructors

Mark widgets as const wherever possible. This tells Flutter the widget won’t change, allowing it to skip unnecessary rebuilds.

2. Avoid Rebuilding Large Trees

Use targeted state management. Instead of rebuilding an entire page, rebuild only the widgets that depend on changed state.

3. Lazy Loading

For lists with many items, use ListView.builder instead of ListView. This creates items on-demand rather than all at once.

4. Image Optimization

Cache images properly and use appropriate resolutions. Oversized images are one of the most common performance issues.