In reply to Nick Nitro:
I did it in a pair of mudclaws and they felt good. However there were also a bunch of people in what I would call 'light trail shoes'.
In terms of the queues, same as everyone else has said mainly out of KLL on the first climb and it thins out after that. I found I could run past people on the ridges although looking back if I had tripped it probably wouldn't have ended up well for me, but as long as you're not endangering others..
Also, I pretty much sprinted down the first descent, passed a lot of people, but my quads were on fire, and I felt it on the second climb - quite badly.
I would do it again if that helps your decision