Measuring Before Optimizing
Don't optimize blindly. Use Flutter DevTools to identify actual bottlenecks: jank frames, excessive rebuilds, and memory leaks.
Widget Rebuild Optimization
The most impactful optimization: reduce unnecessary widget rebuilds. Use const constructors, extract widgets, and use selective state management.
Image Optimization
Images are often the biggest performance drain. Use cached_network_image, proper sizing, and lazy loading for lists.
Build and Startup Time
Reduce startup time by deferring non-essential initialization. Use deferred imports for features that aren't needed immediately.