Hello, I bought this MacBook as a very cheap transition from PC to MAC. Having used Mac before I was expecting a great productivity, even with such an old model. It is customized mid 2007 Mac Book Pro, 2.6 Core 2 Duo, 4 GB Ram, 8600M GT. I tried Lion, even scrolling a webpage in Safari was laggy, playing a video on YouTube was only possible in 240/360p, can't even imagine 720... I am working a lot on Photoshop/Lightroom, main reason to move to Mac, the application also run veeery slow. I can't play an HD video, it drops frame like crazy, almost freezes actually. I installed Snow Leopard after reading a lot of thread where people have the same problem, but here it is even worse. Veery slow performance, far worse than my PC with less hardware.. Can you tell me where the main problem maybe ? What am I missing in this ? With this configuration I have to be able to watch and do the mentioned things above without any problems ?