Hello, I've recently purchased a 13" MBP 2.53, 9400M 4GB etc. Ive come from a 2.93GHz 9600GT hacintosh and I have noticed that changing spaces using ctrl+arrow isn't as fluid as it used to be (dashboard and expose are fine though). It's really frustrating me as there is only 3 or 4 windows per space and its stuttering, not severely, but enough for it to look like its struggling - not nice for a new machine. Is this the same for everyone? It doesn't hang for any length of time, but it isn't completely smooth. Be interested to hear from 9400m users only, obviously the dedicated card owners wont have this issue. I'm running 1920x1080 by the way. Cheers!