Alan,

> I don't know the theoretical answer, only my empirical one. I started
> fiddling with that setting with version 4.2 - I didn't see then nor any
> later version to 5.6 see any difference in performance., not like I did by
> changing the page size.
> Since version 6.01 I don't touch it anyway nor do I know how to anymore

In my experience database cache size does make a great difference in a
multi-user environment, especially if you get rid of the 75-page
default.
I just needed a simple answer to a very complicated question - which I
fear does not exist. :-(
Ciao
--
____
_/\/ando