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What’s the best way to isolate rebuilds using repaintboundary?
Asked on Nov 12, 2025
Answer
RepaintBoundary is a useful Flutter widget that helps optimize performance by isolating parts of the widget tree that should not be rebuilt unnecessarily. By wrapping a widget with RepaintBoundary, you can prevent its subtree from being redrawn when other parts of the UI change, effectively reducing the rendering workload.
Example Concept: In Flutter, RepaintBoundary is used to contain the rendering of a widget subtree within its own layer. This means that when the parent widget is rebuilt, the subtree wrapped in RepaintBoundary will not be repainted unless it itself changes. This is particularly useful for complex widgets or animations that do not need to be redrawn every frame, thus improving performance by minimizing unnecessary repaints.
Additional Comment:
- Use RepaintBoundary around widgets with complex visuals or animations that do not change often.
- Check performance using Flutter's performance overlay to identify areas that benefit from RepaintBoundary.
- Be cautious of overusing RepaintBoundary, as it can increase memory usage due to additional layers.
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