WPF Toolkit DataGrid scrolling performance problems - why?

I am using .NET 4.0 and still get the scroll performance problem. What I did is - disabled virtualization. I set EnableRowVirtualization to 'false' in the DataGrid. This considerably improved the scroll performance.

I would suggest to not assume that whatever is being offered by WPF is useful in all the situations.

The DataGrid has an Attached property, ScrollViewer.CanContentScroll, that manages this behavior. To get smooth scrolling you'll need to set it to False.

After finally making the time to build my application against an up-to-date version of WPF the scrolling problem seems completely gone. So if anyone still uses the toolkit version of the DataGrid just "update" to the version included in the framework and you should be fine.