We have a problem where in IE (6,7,8) RadGrid response is rather slow and we're trying to improve performance. I understand that IE has a slower JS processor, but I think the major issue we have is that for each paging/filtering request, OnNeedDataSource is called and that takes a chunk of time. My question is whether we can have the data pulled once on page load and paging/filtering done on the client side to improve performance?