I have a RadWindow that contains a RadTabStrip, and each tab contains a RadGrid. Performance is extremely slow when the window first opens ... is there anything I can do to speed it up? In general the RadWindow seems slow no matter what it's loading, and the RadTabStrip also seems to slow down the initial page load a lot ... together they are extremely slow. I have ruled out the possibility of slow SQL queries for the RadGrids ... it's definitely not that.