Flutter:widgets.dart:RepaintBoundary A widget that creates a separate display list for its child. See also Flutter Favorite site RepaintBoundary class - widgets library - Dart API (Flutter) RepaintBoundary로 성능 최적화 하기 Flutter RepaintBoundary: 앱 성능 최적화를 위한 핵심 위젯 완벽 가이드