My girlfriends laptop is very slow, I've installed a extra 4gb of RAM so its now running at 8gig. She (like me) is a graphic design so speed is important. I want to install a new hard drive but I have a few questions: 1. Is it worth installing a SSD? Would it make a big difference? Or will a 7200RPM suffice? 2. Which would be the best OS X to upgrade to, will Mountain Lion run okay? 3. What else can I do to get the laptop running like it use to? Edit: "All that happens is that dust and dirt builds up on the inside and prevent it from doing it's job properly." Is this true? Many Thanks, Tom Info on her laptop: Macbook Pro 5,3 8 gig ram OSX snow leopard Very slow start up and opening of programs.