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This question already has an answer here:

If I'm asked for the sudo password, after typing it in correctly, the terminal moves on almost instantaneously. However, if I mistype my password, it takes a few seconds before working it out and asking me again. I timed it a few times, and mostly takes around 2.2 seconds.

Why does it take so much longer, and is there a way to speed it up?

(I have a few dodgy keys on my mechanical keyboard that often don't register, or register twice, so I often mistype my password.)

marked as duplicate by Anthon, Stephen Kitt, Sparhawk, chaos, PersianGulf May 22 '15 at 9:08

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The built-in delay is to slow down the process of password guessing. Looks like someone could programmatically guess about 27 potential passwords per minute, which, as you've observed is a good deal less than if there was no delay.

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