A nice trick to make the autohiding mac Dock appear almost instantly.

  1. Open Terminal.app
  2. Type in this command:

defaults write com.apple.Dock autohide-delay -float 0 && killall Dock

If you ever want to revert these changes and get the delay again, use this command in the terminal:

  1. Open Terminal.app
  2. Type in this command:

defaults delete com.apple.Dock autohide-delay && killall Dock