Hello Brett,
You can check out the Virtual Scrolling feature provided by RadGrid:
http://demos.telerik.com/aspnet-ajax/grid/examples/client/virtualscrollpaging/defaultcs.aspx
Hope this helps.
In addition, please note that currently our developers are working on an improved Virtualization functionality of RadGrid which will offer the users astonishing performance even with very large rows count - for example 50 000 items. This new feature is expected to be introduced in one of the upcoming releases.
Regards,
Eyup
Telerik
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