That's kind of what I was expecting them to be like, but mine are not that way (as they are on the M13 / M19, etc). I'm running the latest firmware, so I wonder why?
So going from around 350ms to get up to where I'm at the end where I can get into the subdivisions will get me some carpal tunnel syndrome... It doesn't seem to change with velocity - just consistent increase as turn. Obviously, as I turn, it turns faster, but not like what I'm assuming you're referring to as on the M series. It's pretty darn annoying... (not just delay, but same with the other effects where trying to change time parameters)