After upgrading to Yosemite: Performance grows slower every hours after not rebooting. If I don't reboot in about two days, I get roughly this performance. First scene: Mission Control. Second scene: Zooming in using Accessibility. Doesn't really matter how many or how few programs I have running. http://youtu.be/VNsquI2EvAY I could personally feel that spending $3400 on a computer should give me slightly better performance after ten months than a Raspberry Pi after an OS update. Any real remedy for this, other than "wait for a software update"?