That's bad. But i really was not able to reproduce the issue. Technicaly, Telescope actually adds its hook which is fired every time any drawing was made on the screen. But this not includes video playback, because XVideo draws its picture on the screen in very specific way. And i had always played video using MPlayer and didn't had any issues with performance... May be if you can upload some video fragment which causes the issue on your device and detailed instruction how to reproduce the issue, this might help me to see it on my device...