Mountain Lion has brought so much life back into my Early 2008 MacBook Pro It Seems. Everything is much much faster, boot is amazingly fast, 2-4 second boot from the spin wheel under the apple logo boot, and everything just feels less sluggish. Seems us older C2D Users are having less issues and more speed increases than the newer Macs. I'd say an 70% Speed increase here. Seems Mountain Lion is the snow leopard for Lion. Some Features added and everything optimized! Update: I and a Friend have done Benchmarking on Mountain Lion and Lion on my Early 2008 MBP and a New 2011 iMac. The MBP has an SSD and the iMac Does NOT. MBP: Lion: NO Geekbench or XBench yet Mountain Lion: No XBench iMac: Lion: No XBench Mountain Lion: No XBench Seems Disk Speed went down on the iMac but General Performance went up on Mountain Lion, but with the MacBook Pro everything went up, we will get XBench and the MacBook Pro's Geekbench up soon! Mountain Lion is Faster! May Be some kind of bug thats causing disk speed on newer Macs Hard Drives to go down.