for me (2013 13" i7 with 8gb ram) mission control specifically seems to be a bit jaggy. Also switching between desktops is not as smooth as it was under mavericks.
Edit: It's not jaggy all the time but only occasionally. Maybe flux is part of the problem, as it has been acting up in the past as well. Runs smooth for the moment.
While flux is calibrating you will experience lag. It goes away after about 20 seconds