Flutter Performance Advanced — DevTools Profiling, Skia vs Impeller, and Frame Budget When your Flutter app feels sluggish, guessing your way through optimizations wastes time. This article covers scientific profiling with Flutter DevTools and advanced techniques including the Impeller renderer migration. Reading the DevTools Timeline Tab Launch your app with flutter run --profile , then open the Timeline tab in DevTools. The three key metrics to watch: UI thread : Dart execution time. Exceeding 16ms causes Jank. Raster thread : GPU command submission time. Heavy ShaderMask or BackdropFilter widgets show up here. Frame Budget : 16.6ms per frame at 60fps, 11.1ms at 90fps. Click any red-highlighted frame in the timeline to see which widget's build() or paint() is the bottleneck. Enable debugProfileBuildsEnabled = true to overlay rebuild counts directly on the Timeline.…