I agree and disagree.
It's mostly about off the ball movement and quicker passing (as well as not having 3 CB's out there) but it's also about having guys who can turn and head upfield quickly or beat a man when pressed/open (Di Maria is great at this, Rafael is pretty good and Januzaj too already, but not sure anyone else is even average). Herrera quickens the pace well with his passing and off the ball movement, but he never plays.
But personnel matters too. You can't really play too fast with both RVP and Falcao not having the pace to get open when dropping deep or wide, Mata also looking ponderous, fullbacks who don't know how to time their runs in (and a lack of possession deep enough to allow for that), and I think teams play a higher line against us than we would with some pace. The Falcao-RVP 1-2 that led to his miss against West Ham was one of the first of its kind we've had all season. Rooney's pace up front, stretching play but also dropping off wide and deeper would help us in that regard, as would his tendency to wander.
TLDR: We aren't generating pace and space due to style and personnel, but if we sign a good wing forward, get Rooney up top and Herrera in the lineup, that should improve.
Depay----Rooney--------
---DiMaria-Herrera--RW--
---------Blind-----------
Shaw------------Rafael/FB
------CB----CB----------
----------De Gea-----------
should be able to play pretty fast. In a tough game, you can always throw Di Maria out right and bring in another CM, ideally a signing.