As of High Sierra the screen lock behaviour is very slow.
The keyboard shortcut for locking the screen the fast macOS way is 'CMD-CTRL-Q' which is too close to 'CMD-Q' for my liking, so I prefer to use Alfred to lock the screen.
It would be great if this was updated so it didn't take ~10 seconds to lock my screen after issues the Alfred system lock command.
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Keep up the great work