For optimizing the performance of your Flutter application, you need to follow the best practices. The top Flutter performance optimization techniques are using widgets instead of Functions, optimizing the layout, using “Const” keywords, employing asynchronous programming techniques, developing and rendering Frames within 16ms, limiting the use of Opacity widget, reducing the app’s size, minimizing network requests, using efficient data structures, and profiling the app.

https://www.biz4solutions.com/blog/how-to-optimize-the-performance-in-flutter-apps/