Cambiar el Dock de 3D a 2D:
defaults write com.apple.dock no-glass -boolean YES; killall Dock
Apagar el Dashboard:
defaults write com.apple.dashboard mcx-disabled -boolean YES; killall Dock
Apagar el Spotlight:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist
sudo launchctl unload -w /System/Library/LaunchAgents/com.apple.Spotlight.plist