Windows 7 Wrong Password Delay

Got curious why it takes more time to invalidate a wrong password?

When you login to your Windows 7 computer you might notice that it takes more time if you type a wrong password than when you enter the right login information. This could be annoying but if you know the reason why this happens it might help you be more patient. Here are two reasons why this might happen:

1. It takes longer to reject a wrong password because the computer has to try more things compared to the case when a valid password is entered. Wrong password might require the computer to connect with domain controllers and also caching login information on local machine does not work well with wrong passwords. For more details you can research the login operation on Windows
2. Having a delay after entering an invalid login information makes it harder for hackers to use dictionary attacks. If rejecting a password is as fast as accepting the correct one then hackers can use brute force or dictionary attacks to crack the password in less time