This seems very odd to me. I just bought this used MacBook Pro a few weeks ago. It has a broken screen - I bought it to hook it up to an external monitor. I just recently tried playing back a 1080p file (like a trailer from Apple) and it has an incredibly difficult time playing it same goes for 1080p mkv files. It starts out smooth, then the fps seems to cut in half, and finally it gets so choppy that it's completely unplayable. Is this normal for this kind of MacBook Pro? I feel like it should handle a task such as this... Is there something wrong with my graphics card? Does anybody out there have a similarly specced machine that is able to do this? Thanks!