So, the delay has a reason! Windows password check

A large portion of the world population use Microsoft Windows  as their Operating System. To all those people, I ask..

Have you ever wondered why it takes a long time to display a error message when you enter a wrong login password whereas if you password is correct, you login in a reasonably smaller amount of time ?

         Most people think that it is their system fault , a slow processor( as if how big data crunching is going on :P).

The reason is so simple and intelligent .
The 2 major concepts are Password caching  and preventing Brute Force Attacks
 It is better explained in the microsoft blog . Go ahead and satisfy yourselves .:)