Track mode shifts harder. Not sure if that equates to quicker but the hard shifts sure "feel" faster. I've noticed that a slight roll out then mash the pedal feels quicker than using the launch button as well though I've not timed that yet. Nice times either way
I'm in Canada so the launch is measured up to 100km. Maybe that's the difference. 60mph = 96 km. My best time is 5 seconds flat. I am noticing minimal wheel spin at launch which is no good but it is winter here after all. I don't know. Maybe a Canadian brother can chime in here.