When I try to view my project video in playback it is very jerky all the time. I have an i7 720QM chip with 6 gb of ram with another 1 gb of video. I'm also running a SSD. All of this in in Win 7 64-bit.

I use to think it was because I'm editing HD video, 1920x1080, but I'm not so sure anymore. Is there a setting I'm missing?