Stuttering during playback in FCP and Quicktime

I just finished creating a 4 minute still/video project using FCP X.  When I play it back in Quicktime, it stutters during both the Ken Burns effect on still images and during video clip playback.  The stuttering is very noticeable in Quicktime, but I can still see it when I playback within FCP, although the stuttering is less pronounced.  Any suggestions for how to smooth out the playback?  Are there known issues with Ken Burns effect in FCP X?
Here is the info I got from the inspector when I had it open in Quicktime.

it seems more like a stopping and starting.  the video clips look great in fcp, but bad in quicktime.  ken burns on stills is not smooth in fcp, but looks much worse in quicktime.  any suggestions? 

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