i got ML installed on 2011 13" air with specs of core i5 1.7ghz, 4gb ram, 256GB fs. and recently bought a new 2012 11" air with specs maxed out (core i7 2.0ghz, 8gb of ram but the flash storage is still at 128gb). so the 2011 air is on ML while the 2012 air is still on latest OSX Lion. i put a same big jpeg picture in adobe illustrator cs5, and exported it at the same time on both computers to a 300dpi, 45cmx45cm in size. it's converted from jpg to a PNG pic. the interesting result was the 2011 air was faster completing it, beating the 2012 air by 10 seconds. i hope it's the mountain lion that makes the improvement, not my 2012 being a dud. anyone have the same experiences?