SpamAssassin 3 memory usage

[Sander Holthaus - Orange XL]

I've noticed that my current memory consumption of spamd (3.x), when using a
number of custom rule-sets such as SARE, is relatively high (~50MB according
to ps). When running with a large number of children, this would consume
quite a large portion of memory.
Or am I wrong here, and is a portion of that 50MB per child actually shared?
 
Kind Regards,
Sander Holthaus