Unfortunately no. When it comes to laptops, you're locked into the graphics card that you chose when you got your system. This is still true with the current lineup of MBPs.
Motion, like Aperture, is looking to that graphics card for some serious heavy lifting. If you really want to take advantage of what Motion can offer it really requires the one, two, three punch. Fast processor/s, lots of RAM and a good graphics card.
I'm on my third 17" laptop. Why? Motion!
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