How do you reduce widget rebuild in flutter?

Flutter involves using const constructors, shouldRebuildSemantics(), const keyword with value types, using keys wisely, using stateful widgets sparingly, and shouldRebuild() method. By implementing these tips, you can improve the performance and speed of your Flutter app.

When the instance of a widget stays the same; Flutter purposefully won’t rebuild children. It implies that you can cache parts of your widget tree to prevent unnecessary rebuilds. Thanks to that const keyword, the instance of DecoratedBox will stay the same even if build were called hundreds of times.