Memory Usage on MS Processes seems high

[chardlist]

My MailScanner processes are each using 79MB of ram.  This seems high.  Is
it, or is this about normal?  I see in wiki that the range should be
20-60MB.

Stats are

MS 4.50.14 on RedHat 9
Msg volume of ~15,000/day
2GB Ram
2.8 Ghz Pentium 4
Bayes is through MySql

Thanks for your time and help in responding,
-Brendan