For me as well !
Two weeks ago I upgraded my girlfriend's 2009 white Macbook (running Snow Leopard 10.6.8) skipping (Mountatn) Lion, and it went faster and the battery lasted longer, despite it contains only 2GB RAM.
Then I upgraded my 2011 MB Pro from ML and same experience. Nearly all apps ran, I only had to upgrade VMware to 6.0.
So this is a great update ! Less RAM consumed, thanks to 'Power Nap' which dumps idle background apps out of the memory.
This technology is already in Android and iOS.
Hackintosh can be useful when trying out a new version under VMware, so without updating the native OS on your Mac in case something goes wrong.
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