Sorry to be contradictory, but speed is in the eye of the beholder.
SHARP tools and good technique are required with all the alternative materials. They CAN be turned at 3000 rpm as several of us will tell you. HOWEVER, if you are attempting to take too much off at a time, you WILL crack (shatter) the material. This is especially true at the ends. Turn the ends carefully. I turn from the outside in and take really small amounts off at a time. Also sharpen my skew a couple times for just ONE pen. This stuff is temperamental, but it is a great pen, when it is completed and the joints are correct.
GOOD LUCK and PRACTICE makes more nearly perfect. (When I start an alternative material, I am still not SURE I will get a usable pen-about 90% completion rate.)