samba - Feb 2008 - vscan module: looking for a quick virus scanner?

Hi,

which virus scanner is a good choice to use with VFS vcan module on a
samba 3.0.24 with 350 users? I played with clamd. It's working, but the
scanning seems to be quite slow. :-( I searched the web, but couldn't
find any good performance tests for linux antivirus scanners. The
scanner should run as daemon, not just as command line scanner. Any
ideas?

Thanks,
Marcus