The RadGridView uses UI Virtualization which means that whilst your data is loaded, it only creates the objects for the visible items. This aids performance. However, there were may further performance improvements, including some to scrolling in the latest Q1 2011 release of the RadGridView, and indeed all of the controls.
I'd suggest upgrading to the latest version to take advantage of this and may other improvements and new controls.
Hope that helps
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answered on 23 Mar 2011, 02:54 PM
Hi Matteo, could you please specify which version are you using. Like Richard suggested, you can try our latest release which contains many improvements. If the issue continues to appear, send us your application and we will try to locate the bottleneck.