Remove the delay for autohide and autoshow using the terminal

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

Return the delay for autohide and autoshow using the terminal

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

Source: http://osxdaily.com/2012/03/27/remove-auto-hide-dock-delay-mac-os-x/

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