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I'm going to the store tomorrow but I'm guessing they won't know much.

I'm looking for confirmation that I can have say a movie running on one screen and working (mail/safari/photoshop) on the other screen without things slowing down too much.
 
I have the base 24"

$1499 model with the 9400M and have a 24" LED Cinema display connected to it.

No performance problems so far, and I use the setup mainly for graphic design and web development.
 
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