It's not blazing fast at all. It's actually quite a dog. Have you even used one?A performance boost? In what way can they boos the performance from the series 8 besides making it go maybe a 1/10th of a second faster? They can't do much with battery outside of very marginal improvements due to the size of the battery they are limited to. Just curious on what a watch that is already blazing fast can improve on performance wise?