Hi! I'm new here and I'm from Brazil, so please don't mind if I make any mistake since I don't speak English fluently. I have a mid 2010 MacBook Pro with Core 2 Duo, it's a 2 years old computer and should be working perfectly and I expected not to be experiencing any signals of it getting older so soon, but I upgraded to Mountain Lion and since then I feel the interface to be a little laggy, even with simple things like scrolling a webpage on Chrome. I work with Photoshop and I found the hand tool to be weird sometimes, it does not move the image smoothly. This is not actually something that blocks me from doing my work and I can live with that, but it makes me concerned that in a short time I will have to change my Mac. I really expect it to last at least 2 more years, mainly because I put 8gb ram on it. I use PCs at work, sometimes slower ones and they work better than my Mac when it comes to interface speed. I heard that Apple will improve the graphic drivers on 10.8.3 update, but I decided to ask here first if someone has experienced the same thing.