[Zope] Memory usage

OK, I'm still confused about Zope memory usage. On a FreeBSD3.4 system, I have a database with (Zope says) 234999 objects in it. Over time it has grown to a 90MB resident set and 172MB size, according to top. This is causing the machine to swap. So I went into database management. Parameters are the default (400/60). It said there were some 6000 odd objects among all the caches. So I did a minimize to six seconds. That gave me 144 objects in cache. It did not change either the size *or the resident set*. In fact the resident set is now 92MB. When I first start Zope, the resident set is about 60MB, and seems to stay there for a while. I've got more memory on order, but something seems a little odd here to me. --RDM