Hmm, I'll have a go at that sometime, though both MySQL and PostgreSQL were (as far as I can tell) both running with default configurations. I guess that's something to consider though, that many people (like me) with their personal sites don't really go past the application to optimise anything more than that. So while default setups for any dbms are most definitely not optimised for a particular application, for many users and in many use cases, they never are.

I don't know what I think either way, but I've got to learn PostgreSQL for course work next semester so for now I'm running with that.