Re: VDPAU and KDE 4.8 compositing = slow
I think shuttering is happing when you override any apps window with another window like terminal, file-manager, video window when desktop effects are enabled in KDE4.8(kwin). I am moving my gnome terminal on file-manager and observed shuttering and window drown is also slow.
Need your comments on this to confirm its really related to vdpau video OR kwin desktop effects. In my case its not related to vdpau video, seems related kwin.
I also observed screen flashes Green when full screen video with vdpau.