I think it's because you don't have to think too much about what your playing when you're playing faster and it just comes naturally.
I played it faster than I usually do, and for some reason, I played much better than I ever had before, and played the tough sections perfectly. It this just a fluke, or is there some reason for this?
I've never agreed with that. People tend to see playing faster as easier, i believe that they're just overlooking too much.