Scrolling in Flutter web appears to perform badly compared to running the same code on an emulator or actual device. With DataTable the performance is unusable.
Is this a known issue? Or is there something I can do to improve the situation?
Edit/update (2021)
This is much improved at present. I'd say mostly fixed.
This is a known issue - see https://github.com/flutter/flutter/issues/42987
I've had moderate success improving scroll performance when building with CanvasKit:
flutter run -d chrome --profile --dart-define=FLUTTER_WEB_USE_SKIA=true
However, this may cause other issues with widget sizing/text rendering/etc. Unfortunately given Flutter Web is still in beta, these types of issues are to be expected.
According to the roadmap (https://github.com/flutter/flutter/wiki/Roadmap), bug fixes for the web (and desktop) are a priority for 2020, so I am hopeful that some of these issues to be resolved later in the year.