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?

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