flutter-performance

Flutter performance and app-size optimization (Flutter 3.47 official perf docs + LeanCode) - jank and dropped frames, excessive rebuilds, heavy build() work, isolates/compute, long lists (ListView.builder, GridView.builder, slivers, shrinkWrap), image memory (cacheWidth), Opacity/saveLayer/clipping, intrinsics, Impeller, RepaintBoundary, CustomPaint shouldRepaint, Flutter Web rebuilds, APK/IPA size analysis. Use this whenever the user reports laggy scrolling, stutter, freezes, high memory/OOM, slow startup, a big app binary, or asks to optimize or review a Flutter screen/list for performance.