I bought a new MacBook Pro Retina (13-inch) last month with a 256GB SSD. It came with Mavericks out of the box and on my first boot up, I upgraded it to Yosemite. Now for some reason, it doesn't feel like a 'Pro' -- as in it feels sluggish, has jittery transitions/animations and everything feels slow. I wouldn't have noticed much, but coming from a MacBook Air (2012) with 4GB of RAM and using it for 2 years, this feels really slow. My MBA still runs much faster and feels great overall with Yosemite, not the same with rMBP though. Both have OS X 10.10.1 with MBA having more apps installed and rMBP is still kinda new. Any suggestions on how to fix this MacBook Pro?