Speed up iPhone SMS app

I found that after some weeks of usage, my SMS app on a iPhone 3G (iOS 3.0.1, JB) seems to take a few more seconds to start than usual.

On all other cellphones I had, you had to delete old messages because of memory constrains and to make the app work better. Does this apply to the iPhone as well?

If so, how can I delete all messages of all contacts that are more than 1 month old, or something?

As the SMS database is SQLite based, I could script it. I even found this link regarding this but has been hesitating to use it.

How do you do it?

Not for the faint of heart, but I've done some research into iPhone daemons, and deleting/ disabling certain ones can have an impact on speed. Here's a lesson from BigBoss about the subject. Here's a list of daemons and what they do (I found this really helpful).

Hope this helps!

I cannot remember where I read this, but turning off Spotlight search indexing for messages should speed it up. Go into Settings: General: Spotlight Search, and uncheck Messages.