It's possible to change the time it takes for Mission Control to complete its animation. I'm all for decreasing animation times in Mountain Lion, so this is a handy tweak if you're interested in a similar thing.
In Terminal, type the following:
defaults write com.apple.dock expose-animation-duration -float 0.1 ; killall Dockwhere 0.1 is the time; you can set it to any number you want; try several different numbers to see how this changes the animation. Press Return, and Mission Control's animation time is changed.
defaults delete com.apple.dock expose-animation-duration ; killall Dock[kirkmc adds: This is one of those hints that is, in part, "because we can," but I do understand the desire to make certain animations a bit snappier.]
Mac OS X Hints