[trhway]

>The full page contains 38,000+ (!) elements, which is not how you build a fast web app! The obvious thing to do here would be to change to using a data grid with virtualized rendering

more than 20 years ago we worked on a browser and had tests with tens of thousands table rows. That was fun. The 40K elements today should be absolutely no issue ... until of course :

> the entire page is laid out when you scroll the grid.

and that is the root issue here. For the smooth scroll it should be scrolling over already laid out page (or at least laid out well ahead part of the page).