Hi All, I'm using my late-2009 iMac to play 1080p footage - should it be able to cope with this? I notice that sometimes it goes a bit laggy/choppy. I am using iMovie to edit my GoPro footage. I mainly shoot in 1080p 30fps or 60fps. When playing in full screen, it goes a little choppy. Again, is this normal? I'm looking for a way that I can continue to edit, but keep the final render in a decent 1080p quality. Cheers!