Speed is definitely the issue. Mark definitely has some degree of superhuman speed. His reactions should be in the, eh, hypersonic-ish range? Yes, like many bricks with speed, he casually forgets this most of the time, but feats like moving the contents of a room to an apartment hundreds of miles away piece by piece and setting it up during a sentence is pretty good.

Speed is just so hard to peg, however, and I don't pretend to know enough about the full range of Jump-ers.