I wonder if anybody else has this or a similar problem. My Mission Control animation is not just choppy the first time I use it (after some longer no use period of I don't know 30 mins) it needs about 2 seconds and has nothing that could be called a fluid animations. Immediately repeating the same thing 3-5 times and I get a fluid animation. It is as if it was optimizing the animation when needed and only then loading generating the preview windows that initial run. There is also a huge difference between when a full screen VM (VMWare 4 Win8) is running, even if it is on a difference space and in stand by(which means only a big black nothing). Also not combining the windows to apps seems to be terribly optimized much slower and bad arrangement. I once tried creating a new user with new setting but that only initially seemed to help. With the same load it did just the same. I use a 15" MBP 2010 HD (256MB 330M) with a 1080p external screen. I works well enough if I shutdown the VM and frequently trigger the MC. That way it doesn't unload but simply redo the prepared animation. However typ a little in word and only use Chrome on the other window and ignore MC for a while and the next use is seriously annoying again. It is the same to a not so incredibly slow degree with left right desktop switching or crtl+1..4 direct jump. I never did a clean install because I got so many settings and stuff that not transferring any settings would take me 2 weeks to be back to normal again. Finding the responsible OSX only settings is real hard and user settings didn't seem to cut it. I wonder if anybody else has similar problems and somehow resolved them, or if people just not really tax the system, all have newer systems, or just take it as normal that MC needs a warm up. Snow Leopard never had any such problem. App Exposé was always fast, spaces never stalled for a millisecond and normal exposé wasn't choppy either. I have more or less stopped using MC because it is so slow and only switch via Alfred or Dock between Apps. App Exposé is something I really liked to to switch between Windows of one app. Alfred is no help and alt+tab isn't efficient.