Mac trick for a fast hiding dock

davecap:

If you want to increase the speed that the dock hides and shows, and remove the delay so that you don’t waste those precious milliseconds, copy/paste these commands into your terminal:

    defaults write com.apple.dock autohide-time-modifier -float 0.05
    defaults write com.apple.dock autohide-delay -float 0
    killall Dock
  

You now have a fast hiding dock!