I was playing with new Silverlight 4 and to my surprise when I run my sample application in OOB all animations become very jerky when I moved mouse around during animations, but when I run my app in browser animations are smooth even when moving mouse around.
I tried my app on two different computers, turned on GPU acceleration in OOB settings - and got the same jerky result.
Is this a know problem with Silverlight?
I'm running WinXP SP3
UPDATE: Tested on 3 Windows 7 machines - no issues at all (running in OOB and in browser), tested additional 5 WinXP SP3 machines - 100% reproducible problem on any Silverlight 4 app running in OOB