I will cover how to disable or change the animation-time of Lions Mission Control in this short post.
To disable the Mission Control fade-in and -out, open a terminal and type in:
defaults write com.apple.dock expose-animation-duration -float 0
The ‘killall Dock’ command will restart the Dock application and it loads the newly made changes.
For shorter animations (or longer if you like animations ) change the ’0′ in the code.
If you want to bring everything back to normal state, use this line:
defaults delete com.apple.dock expose-animation-duration