Hey! Just upgraded to Mountain Lion, Is anyone else finding the graphics especially the UI to be worse than in Lion? I had problems at first with my first rMBP running lion it was terrible at running the UI. I soon had this one replaced and have found my further two replacements to run without a problem. Upgraded to Mountain lion in the last couple of hours... so far have found it to feel as though Lion actually ran smoother in regards to UI. Little disappointed if I'm honest. Any reasons for why this could be?