[Clamav-users] CPU & clamscan

Hi, I use clamav-0.90.3 (with amavisd-new-2.2.1, maia-1.0.2 and postfix-2.2.8) but for some days the system is very slow, pheraps the problem is in the cpu load (my CPU is Intel(R) Xeon(TM) CPU 3.00GHz (3000 MHz)) from clamscan, in particular I have:

/usr/local/bin/clamscan --stdout --disable-summary -r --tempdir=/var/amavisd/tmp
/var/amavisd/tmp/amavis-2

#top

PID          USER         %CPU          COMMAND
5357          amavis            78                   clamscan

..and often the %CPU is 90% or 99% !!

The command 'clamscan' is:

/usr/local/bin/clamscan --stdout --disable-summary -r --tempdir=/var/amavisd/tmp
/var/amavisd/tmp/amavis-2

..there is a problem with in CPU or in clamscan ? Thanks.