Hi,
We do not see an issue in this behavior. While you scroll, there are a lot of calculations happening. I cannot observe a delay in the scrolling, too. That is the reason I asked for a sample which demonstrates an issue, because if you have a TreeGrid with auto-height and if that is the case, all cells to be added to the DOM, your page will freeze for sure, because web pages can display only a certain amount of html elements.
Regards,
Markov
