We are, Elfman. Performance is one of the main goals for both SP2 and Q2, together with better and much improved documentation. We are currently reworking the layout mechanism, which will help us improve performance quite a bit and will allow for many new Grid features. We think that we will be ready with it for Q2, together with the much demanded hierarchy feature. We will post the performance gains from the new layout once we implement it.
Thanks a lot for your feedback.
the Telerik team