Hello, Since upgrading to Yosemite one thing i'm noticing is the longer I leave my mac before restarting the more ram it is using. After a day or two of it being on the available ram is around 17mb-26mb (with just mail, finder and safari open). I've not noticed it feeling that slow, but have noticed about of UI lag. The main culprit it looks like is WindowServer. When first starting the computer it uses a normal usage, after a day it was around 6gb and now it is up to 8.9gb used memory. Thanks.