Speed Up Mac Dock
I always have the dock on my Mac setup to autohide. But the default setup is far too slow!
defaults write com.apple.dock autohide-time-modifier -float 0
defaults write com.apple.Dock autohide-delay -float 0
killall Dock
To return to defaults:
defaults delete com.apple.dock autohide-time-modifie
defaults delete com.apple.Dock autohide-delay
killall Dock