Slow USB/drive performance with new (Oct 2011 release) MacBookPro

I am a Final Cut editor, and began using FCP X about three months ago. I was using my wife's 13" MacBook Pro (previous revision 2.7GHZ i7 dual core, 4GB RAM, OS X 10.6.8) to play with it, and I was able to edit a few projects from a USB 2 drive.
However, on my new (2.4GHZ i7 Quad core, 4GB RAM, OS 10.7.2 part: MD322LL/A) the same video project is choppy, and there's a spinning beach ball when quitting Final Cut that lasts about 25 seconds.
Any ideas why the newer MBP with better graphics and quad cores would be having more trouble with video playback than the (slightly) older dual core machine? The only other difference between them is my computer came pre-loaded with Lion, and the 13" has snow leopard. I don't think I can install Snow Leopard on the new computer to eliminate that variable.
I suspect there might be something going on with the USB port speeds, but beyond running the hardware test (doing it now) I don't know how to test this and know whether it's a "good" speed or not.
Thanks,
~Ryan

I am a Final Cut editor, and began using FCP X about three months ago. I was using my wife's 13" MacBook Pro (previous revision 2.7GHZ i7 dual core, 4GB RAM, OS X 10.6.8) to play with it, and I was able to edit a few projects from a USB 2 drive.
However, on my new (2.4GHZ i7 Quad core, 4GB RAM, OS 10.7.2 part: MD322LL/A) the same video project is choppy, and there's a spinning beach ball when quitting Final Cut that lasts about 25 seconds.
Any ideas why the newer MBP with better graphics and quad cores would be having more trouble with video playback than the (slightly) older dual core machine? The only other difference between them is my computer came pre-loaded with Lion, and the 13" has snow leopard. I don't think I can install Snow Leopard on the new computer to eliminate that variable.
I suspect there might be something going on with the USB port speeds, but beyond running the hardware test (doing it now) I don't know how to test this and know whether it's a "good" speed or not.
Thanks,
~Ryan

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