Sup guys,i have discovered why my sony vegas was lagging,when i use sony vegas i use to insert 2 videos : first video its the face cam and the second its the gameplay but it laggs and i dind't know why it lagged but now i know.When the face cam its inserted in sony vegas it makes it to lag.The face cam its the video with my face so i have to insert it first then i insert gameplay then i make the video with my face smaller and place it on the top of screen now you get what i am speaking about so yea the video with my face makes the sony vegas to lagg i have windows XP and i record myself with movie maker the file is .wmv any suggestions to help me ? please

PS:It seems the problem its not from my pc specs as i thought.