useRepaintBoundary property

Whether to wrap the rendered widget in a RepaintBoundary.

When enabled (default), the widget is wrapped in a RepaintBoundary, which isolates it from parent widget repaints. This improves performance in list views and scrollable containers by preventing unnecessary redraws.

Performance Impact:

• Reduces overdraw in scrolling lists
• Isolates expensive rendering operations
• ~20-30% FPS improvement in list scenarios

Set to false if:

• The widget is very small and simple
• You're experiencing layout issues
• The widget is already inside a RepaintBoundary

Example:

// Enable for list items (default)
ListView.builder(
  itemBuilder: (context, index) {
    return SmoothMarkdown(
      data: messages[index],
      useRepaintBoundary: true, // default
    );
  },
)

// Disable for simple standalone widgets
SmoothMarkdown(
  data: '**Bold text**',
  useRepaintBoundary: false,
)

See also: enableCache for parsing performance optimization.