flutter-perf-rendering-effects
Use when DevTools shows high raster time or janky raster frames. Optimises only where profiling or implementation evidence shows real cost, and keeps the visual design materially unchanged. Investigates expensive Flutter visual effects and raster cost: Opacity, BackdropFilter, blur, clipping (ClipRRect, ClipPath), large or layered shadows, overlapping transparency, saveLayer, and continuously animated effects. Do not use for UI-thread rebuild problems (flutter-perf-build-and-rebuild).
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