To reiterate what's already been said: Anything with the word "patch" after it is pretty much crap and should be avoided at all costs. Dynamic cpu scaling patch? The N900 already has that natively, without the need for a patch. If the "patch" is tweaking values, better to use a program like swapolube that at least can save/reset your default settings.

I would also recommend a clean reflash and reinstall. The built-in backup program can save and restore by category, so you can backup just contacts and calendar, then reflash and restore just those. That's the safest route.