getting better performance

Hello!

I have a postgresql server serving thousands of tables. Sometime there are
queries which involves several tables.

In postgresql.conf I have these settings:

shared_buffers = 40000
work_mem = 8192
maintenance_work_mem = 16384
max_stack_depth = 2048

all other settings are left by default (except ones needed for pg_autovacuum).

Is there anything I can tune to get better performance?

--
Eugene N Dzhurinsky