My 2.2GHz MBP has serious issues with Quartz Extreme effects and apps such as Aperture in iDVD. Exposé often stutters unless I activate it repeatedly in quick succession. Aperture (which is known to be GPU-reliant) crashes constantly (at least once every working session while applying image adjustments), beachballs a lot, and is extremely sluggish in applying changes after a crop has been done. The DVD menu previews in iDVD 6, which are dynamically generated, lag the first couple of seconds. Finally, dock animations, such as jumping icons, also stutter. The last drop which made me post this was seeing a Mac Mini display the RSS screensaver silky smooth on a huge LCD-display, while my MBP stutters when the text rotates by. Alright, at this moment I cannot recreate the RSS stuttering, but I still find all this very odd, as it's nothing I've experienced while trying out other, older generation Macs in stores. Is all this just due to Apple still not having optimized the 8600GT-drivers? A friend of mine actually went with Lightroom instead of Aperture just because of it's appalling performance on SR-based MBPs.