I have a late 2008 2.4Ghz MBP with 3GB of RAM and Snow Leopard. It's great, but recently I've started to use iMovie a lot more for slideshows. One thing that frustrates me is the speed of iMovie. It takes several minutes for iMovie to get in a usable condition when opening, and then when working with a large project (~13 minutes, 175 photos), it's very slow. I'm guessing this might be a processor and GPU issue which makes me wonder if a new MacBook Pro with say a 2.2Ghz i7 and 4GB of RAM would be faster with iMovie. Any comments?