Slow Export FCP X, need to use more CPU %

Hello Hello!
Thanks in advance for your help!
I am trying to export a video from FCP X and it is taking forever! My end goal is to run it through compressor, when I sent it to compressor from FCP X it said it was going to take 4 hours. This is a 12 minutes clip. Shot on 3 different cameras.
I read a number of forums and many people advised me to first export it using fcp X - Export Media (Apple + E) and then run it through compressor. That this was the fastest way.
It has been exporting for the last hour and has 80 minutes left.
I have opened up activity monitor and noticed that around 60% of my CPU is idle. When working in FCP X usually my this number is usually down at 15%.
Basically, how can I use more of CPU power to speed up this process? Is there a reason why so much of my CPU is not being used?
Is it running slowly because it has to transcode 3 different video files that all use different codecs?
What would be the best way to speed this whole process up?!
Specs:
Mac Book Pro 2.8 Ghz i7 with 8G RAM
Mac OS X 10.6.8
FCP X 10.0.2
Video file 1: 1920 × 1080 H.264 shot on Panasonic HD Handicam
Video File 2: 1920 × 1080 H.264 shot on Go Pro 2
Video FIle 3: 720 × 576 m2v1 MPEG 2 shot on Old sony dvd handicam - I know, I need a new third camera.

Hi Giles,
Thanks for getting back to me.
Yes, all the files were optimized when imported.
However the timeline was not rendered. Only when using this particular project (Lots of different video files and effects on every single clip) the background render take FOREVER. I left it on last night while i was asleep and 8 hours later it still had 15% to go.
I tried exporting again - and it was quicker this time - only 1 hour for a straight export - but the point is I still had to background render for 8 hours to get it down to that speed.
You ever experienced background rendering that takes that long? And advice on why its taking so long.
Surely even with a lot of effects - keyer & masking - it should never take 5+ to background render a 11 minutes clip.

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