Ok, so I have a Macbook Pro 13", the baseline edition, and whenever I try to watch a 720 or 1080p video on Youtube it always has to buffer. In this video: http://www.youtube.com/watch?v=1FJdNc46OMY there seems to be no buffering at all. Can someone explain this to me please? EDIT: Actually, even 320p videos stop and go all the time. Is this normal? Sorry, I'm sort of paranoid since this is my first Mac.