Lion’s new window animation is fairly subtle, but still, there are those that dislike it. Basically, the animation grows the new window from a tiny version of itself. Here’s how to go about disabling it.
1. Close any applications that are currently running (or relaunch them later, they’ll just continue to use the new animation until relaunch).
2. Open Terminal.
3. Execute the following Terminal command to disable the new window animation:
defaults write NSGlobalDomain NSAutomaticWindowAnimationsEnabled -bool NO
If you wish to enable the new window animation, execute the following Terminal command:
defaults write NSGlobalDomain NSAutomaticWindowAnimationsEnabled -bool YES