Dropped frames on MultiCam editing with Canon XF305 Footage

Hello,
I recently purchased three Canon XF305 series cameras and have been conducting a series of tests to determine the best recording format and editing workflow. First, does anyone have experience with these new Canon cameras?
Using the log and transfer utility, I've been bringing the files into FCP natively using the canon codec (which is actually mislabeled as a Sony codec). Once in, the footage looks good to edit, without requiring rendering.
However, when I setup a multiclip sequence with the three cameras, the render bar turns green and I'm getting all kinds of dropped frames on playback. Is this a computer processor issue, drive speed, or codec? The multiclip is the only time I have trouble -- once I collapse the multiclip, I can edit fine without any drop frames.
I've done tests using 5400x and 7200x drives using both firewire 800 and eSata, no changes. I believe that rules out drive speed.
Is this a processor issue? What can I do to resolve this, as our workflow involves 100+ hours of footage from 3 cameras.
Thanks in advance

but my experience with the 305's in ProRes is that it makes it a bigger file(more than double)
Of course it will. XDCAM is a highly compressed format. ProRes is a larger file type, higher data rate. It will be larger. Did you not notice that the ProRes footage from the 5D were also about 5 times larger?
and still needs to render.
If you worked in a ProRes timeline, then you shouldn't need to render. If you still do, than something is wrong. Create the file...make a new sequence, cut this into that sequence...FCP will make the settings match. If it does this, and you STILL need to render....you did something wrong.
when I actually converted to ProRes, it seemed like it was more taxing on the computer, took up twice the hard drive, and more than three times the time to transcode compared to native.
It is less taxing to actually edit with. GOP formats require the computer to constantly process the GOP footage to show you frames...since there are no real frames in any GOP format. Well, there are 3 frames every second, then a bunch of pictures, and the computer has to guess what is next by looking at the frames, and then the pictures, and make up the in-between. PRORES is a full frame format...no guessing, no computing. And larger files are not more taxing on the computer...they might require faster hard drives...and larger ones, but they are less taxing. Yes, longer to convert than native, but when that is done, things are easier.
But, do what you want. I just gave a suggestion.
Shane

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