Disabling the Delay of the macOS Dock Fade-in
Since windows in macOS cannot overlap the Dock, hiding the Dock often provides an effective way to gain additional screen space. This can be particularly helpful for smaller screens. Unfortunately, a delay always occurs until the Dock reappears when moving the mouse close to it. Fortunately, many hidden settings in macOS can be altered using a command line utility named defaults. To trigger the Dock's fade-in animation instantly, hence completely disabling the delay, you have to enter the follow
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