I am experiencing issues with IE7 as well (Firefox & Safari runs fine). I have gone through all the links you keep suggesting to people but have found no useful information. Here's a summary of what I've got:
- RadGrid - all columns are template columns - 2 x RadNumericControls and 1 RadDateTimePicker + DataBoundColumn
- RadCompression enabled
- Using RadAjaxPanel and RadScriptManager
- The page persists the view state in server memory so I cant imagine disabling viewstate will help the problem
- Loading around 70 records.
I think I have done all the things you recommend but still not seeing acceptable performance. Can you please give me any further suggestions - I am using RadControls 2009.2.826.35