Interesting, I was in the same upgrade boat, but went back to 10.8 on my Mid-2011 MBAir. With only 4GB of ram, 10.10 was killing me, constantly spooling up the

Interesting, I was in the same upgrade boat, but went back to 10.8 on my Mid-2011 MBAir. With only 4GB of ram, 10.10 was killing me, constantly spooling up the i7 & fan to screaming levels.