I am getting choppy playback, what's wrong?

I am currently using a Canon t4i rebel hdslr filming at 720p/60fps. 
As far as my computer specs go, I use a macbook pro 13" from 2009:
2.26Ghz Intel Core 2 Duo
8Gb @ 1333 Mhz DDR
Nvidia Geforce 9400m 256mb
and OSX 10.8
My video playback is so choppy no matter how small the clip is. When I preview out of the software FCP X the video is smooth and has not problems.  What can I do to make it smooth in fcp? This playback is with no filters, just as is.  Is it the settings I have to mess with? or is it a hardward issue.  I have already tried going to "Use media proxy" but the video clip turns red and says "missing proxy".  It also can't be previewed.  Some please give me some tips and advice for this problems.  Thanks

Hi Tom,
   Thanks for your reply. I have now discovered, and this should also help the original poster here, that FCPX will stumble and fall on playback of media on a machine with 256mb VRAM. One has indeed to use proxy media or face instant frustration with the software. Apple have been very disingenious in stating 256MB VRAM as a minimum requirement to operate the software, as FCPX will effectively only halfway function on that hardware and has to use proxy media.
  Why they couldn't just state this in the specs is beyond me, instead you are faced with a dialogue telling you to upgrade your hardware. So, after you have already shelled out for the kit listed by Apple as sufficiant to run FCPX, you discover that you need something more powerfull to accomplish even a basic playback of supposedly supported media.
  Back to the 'proxy' route then...
   Best,
   Niall

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