Guido,
Heh, now you see the uselessness of the PostgreSQL-Advocacy list. If
it's not about Postgres vs. PostgreSQL vs. MySQL, you don't get an answer.
So, here's some useful information:
http://www.postgresql.org/docs/techdocs.83
http://www.postgresql.org/docs/techdocs.84
Also, I'm concerned ... what do you mean by "default install"?
--Josh