[Mimedefang] Looking for more ramdisk benefits

[Peter Campion-Bye]

I moved /var/spool/MIMEDefang to a ramdisk and got a 20% improvement in
scan time (It's a slow old disk in the box)
Before I spend ages experimenting, has anybody found any worthwhile
improvement by moving other stuff to ramdisk, the SA rules for example, (I
expect these are just read once and cached) How about the clamav db?
Is there anything that's read into memory off the disk on every message?
Thanks

mimedefang 2.39  sendmail 8.12.9   clamav 0.65  spamassassin 2.63