Improving performance of postgresql

[vittorio]

Under freebsd 6.1 on  a pentium 4 with 256 MB I compiled and installed a 
postgresql (now 8.0.8) server which has been running wonderfully.

I tailored the conf files to tune the server with my hardware according to the 
many suggestions I read in the net which are OS-independent that is that 
apply to any *nix (or better linux-centric).

Now I would like to know if for a postgresql server there are settings more ** 
freebsd specif ic ** to improve performance.

Ciao
Vittorio.