I would expect that most, if not all, manufacturers max out the parameters set by the USGA/R&A. With this in mind, the velocity of golf balls has been maxed. The changes in golf balls now is mostly to playing characteristics. In order to get maximum distance per your swing speed will be based on matching your swing characteristics to the correct golf ball; this is why ball fitting can be so important. Your launch angle and spin generated by your equipment and swing are critical factors in choosing the correct ball.