I noticed something really interesting at the Apple Store today... So I bought a 2014 13" rMBP and I've become really quite concerned about how ridiculously laggy the expose animations are. I decided to go to my local store and see if the new Macbook Pro's are better and whether it really is a hardware limitation. Well, first thing I noticed is the new 13" rMBPs are much smoother in expose animations (with fullscreen apps open that uses transparency). But I also noticed that in Activity Monitor, they don't have the WindowServer process at all. The thing that slows down my computer when swiping between screens is the WindowServer process. It happens when there are apps open that use the new Yosemite transparency effects and I'm swiping between them (e.g. iTunes and Safari). I can watch Activity Monitor while I do it and see the CPU usage of the WindowServer process spike up to 50% at times. It's definitely what's causing the problem and the new Macbook Pro's (which don't have the problem) don't have this process running at all! It's not just reduced in footprint but literally not there at all. Of course they're just running Yosemite 10.10.2 like every other mac, so how is this possible? And does anyone think this change is on it's way to other macs?