Hi Wolfgang,
Thanks for using Syncfusion products. It is the default behavior of the SfDataGrid to animate when ScrollToRowIndex method is called. However , the scenario mentioned by you has already been taken into consideration and works are currently in progress for providing this enhancement of quick scrolling with reduced animation time. You can expect this enhancement to be available in the upcoming 2017 Volume 4 Service Pack 1 Release, scheduled for roll out in the last week of December 2017(tentative). We appreciate your patience until then.
Regards,
Vimal Prabhu