Hello everyone,
Currently some very persistent bot is trying to brute-force a login/password combination to the site. We can't stop it since it's changing IPs after every attempt, and it seems to be a dictionary attack with a list of known e-mail + password combinations. Probably using a database which may have leaked from another site, or been obtained from a hacker online resource. Anyway, if you think your login credentials may have been compromised somehow, that would be a good time to change your password.
The site may behave a little bit laggy due to a lot of connections generated by the bot. Sorry for the inconvenience, hopefully it will deplete its resources soon.