Simon,
I guess I didn't state my question clear. The problem I am having is not in having to wait for rendering, but that when I use more than 3 videos in the comp, the render or pre-render "choke", the individual videos stutter and freeze within the comp. I posted earlier here:
http://forums.creativecow.net/readpost/2/939508
but didn't get any replies.
Thanks for replying.