Actually it is not. Edges, stroking, one foot skating and generating speed effortlessly are... but speed does not necessarily mean "very fast"
Also speed isn't the only way to skate well and certainly has not much to do with rotation unless you mean speed of rotation itself.
Liza Tuktamysheva skates slowly but can do 3As
1. I mean speed in rotations.
2. Speed in rotation correlates well with skating speed.
3. Tuktamysheva has clearly more speed in skating and rotations than Kihira or Miyahara.
4. Everyone on this level has edges and can skate on one foot.
Speed makes the differrence.

