I have recorded my gameplay of the xbox through a hauppauge HD PVR2 i also recorded myself commentating and overlayed the two putting my elf on the top right of the screen my question is when i imported the gameplay it started to lag when i wanted to playback just a little bit but when i added my overlay it really started to lag whyis that? Is it common? And how can i stop it? Please i need help i would greatly appreciate it!!!!!