WP Login Delay is a plugin that adds a one second delay when logging into the system in order to slow down any brute-force attack on your website.
This plugin does what it says, it adds 1 second (adjustable) to your login time to reduce brute force attempts.
Very nice little plugin. I thought I wouldn't able to find that simple solution separate from other security features and will be compelled to write it myself. So thanks to the author for having it done for me. My failed logins log now shows only up to 10 attempts a day, while recently these were about 500 attempts for 2 days. Looks like bots don't like not responding immediately websites :)
The plugin says it adds one second delay on the login step, and that's what it does. Nothing more, nothing less.