ResolutionBy default DrWeb and Qmail communicate via TCP socket. You can try to use local socket for that purpose, it should be faster.
Add the following string into /etc/drweb/drweb32.ini so DrWeb would create file socket:
And the following string to /etc/drweb/drweb_qmail.conf so that qmail would communicate with DrWeb via this socket:
Address = local:/var/drweb/run/.dr.daemon
Test how it works and look into logs for the socket usage: