Multicamera function choppy

I am on a IMac 3.06 Core 2 Duo with 16gbs of Ram and 1TB of hard drive (600gigs available). Just got Pro CS6 and am trying to edit footage from 2 Canon T3is .mov files. The Multicamera playback is extremely choppy and impossible to use. I am a beginner. Is there something I should be doing?

via Adobe Community : Popular Discussions – Adobe Premiere Forums http://forums.adobe.com/thread/1100351