How to configure a read-only database server?

I browsed the faq and looked at PostgreSQL performance books but I
could not find the obvious:
How to configure a read-only database server?

I have a single-disk virtual Linux system and a read-only dataset
which is exposed to internet and completely replaced from time to
time.

This is what I found so far:

* Disabling autovacuum daemon.
* Setting postgresql.conf parameters:
   fsync=off
   synchronous_commit=off
   full_page_writes=off

* For the session:
   SET transaction_read_only TO FALSE;
   SET TRANSACTION READ ONLY;

* What about wal_level and archive_mode?

=> Any comments on speeding up/optimizing such database server?

Yours, Stefan