Hey Guys, Just upgraded to ML. I have an rMBP 2.6 with 16 gig RAM and 512 SDD. ML overall definitely is quicker. The start up now takes less then 10 seconds vs. 15-16 sec with Lion. Safari is faster. Interestingly, I have noticed that when switching spaces, the wallpapers stutter (drop frame rate) somewhat when on the integrated card. When on the discrete graphics, it is butter smooth. I don't recall spaces switching ever being an issue with Lion when on the integrated card... anybody else having this issue?