title: flutter web DataTable scrolling - horrid performance
body: <p>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.</p>
  <p>Is this a known issue?  Or is there something I can do to improve the situation?</p>
  <p>Edit/update (2021)</p>
  <p>This is much improved at present.  I'd say mostly fixed.</p>