Timeline playing back very choppy over multiformat video.

Hi Guys,
I am editing some behind the scenes footage for a movie our studio is making. A lot of the media has come from different sources. Some red, some mpeg4 etc. The Mac i am using is a Quad Core Mac Pro... technically it should be powerful enough to play over all these fine. But even when everything is rendered, it is very choppy. So much so, that to check my audio is in synch for some of the action shots, i have to export it as a Quicktime and play it back and check it that way.
Now i have tried RT in unlimited and safe... but it still happens. Does anyone have any possible solutions at all?
Any help would be much appreciated,
thanks in advance.

Please give your full system specifications, what computer, what drives, what camera or deck, how everything's connected, what settings are on the media, what settings you're using in Final Cut, and finally what version of the software, of the OS, and of QuickTime you are using.

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Timeline playing back very choppy over multiformat video.

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