I think more thought should be given to safety as an element of performance. Not only do I want a bike that runs well, is fun to ride, and goes fast, I want one that will stop when I need it to, is comfortable to the point that I can enjoy the experience without walking bowlegged the rest of the day, and one that has minimal amenities like lights and fenders in case I get caught in the rain. In addition, I don't like fixing stuff on the side of the road so I don't want fuel leaks, loose wires, or parts that fall off.