Courier pop3 very slow login under load

[EurowebS]

Hi,

we are experiencing very very slow response times (when logging-in) with the courier pop3d when the server is under load. This might be very logical, if there wasn't the fact that smtp and imap are running without any problems and with very good responsiveness under the same load. We've tried disabling logging and reverse lookups, but there are no improvements, and the pop3d needs 30-40 for the login process. Any help will be appreciated.