nativeapi_resize_lag

Minimal Windows Flutter app for comparing window resize behavior across nativeapi versions. It keeps the default counter app and adds a small diagnostic panel. The same Dart code works with 0.2.4, 0.2.5, 0.2.7, and 0.3.0.

Reproduce

Use Flutter 3.47 or newer on Windows. Close each run before changing versions. For each version, run these commands from this directory, replacing 0.2.5 in both places:

flutter pub add nativeapi:0.2.5 cnativeapi:0.2.5
flutter clean
flutter run -d windows --release --dart-define=NATIVEAPI_VERSION=0.2.5

Drag the right or bottom window edge back and forth continuously. Compare the window's motion against the pointer and watch the diagnostic panel. The panel shows WindowManager resize event count, reported native size, Flutter metrics event count, viewport size, and the latest and largest time between events. The panel refreshes only four times per second so it adds little work to each resize event. The counter button verifies that this is otherwise a normal Flutter application.

Observed in the original application

• nativeapi 0.2.4: resizing is smooth.
• nativeapi 0.2.5, 0.2.7, and 0.3.0: resizing stalls and the window moves in jumps; GPU usage spikes during the drag.
• Both debug and release builds show the lag.
• A clean rebuild after changing the package version is necessary for a fair comparison.