Despite everyone saying that Mac OS requires no maintenance, I think that's a lie. My Macbook (2007) has been degrading it's performance slowly, despite it's RAM upgrade I got it 2 years ago. Every program beachballs quickly and even Finder gets slow as molasses. I've checked the HDD status and it's ok, the RAM is also working correctly. So basically, I'm between a format and OSX reinstall or some other maintenance tips I do not know about. Does anyone have any tips before I resort to the destroy to create again?