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This question already has an answer here:

It takes almost two seconds before my linux machine replies the password is incorrect while the correct one gets accepted almost instantaneously.

marked as duplicate by cuonglm, Anthon, Archemar, taliezin, Community Sep 9 '15 at 5:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Actually, that's an intentional delay to prevent someone from being able to brute force a bunch of passwords in a short time.

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