Efficiency first, always. Sing it to the gods. Glad we're all coming around on it. Glad GMac demands it.
Also, two things about fast-pace play (which I love, to be clear): it demands rebounding proficiency to start the break, at least two guys that can push tempo with the ball and have high end handles (again, totally fine) and then you need to be able to finish at the rim and at the three point line.
I love all of it. But it's very demanding on rebounding, the primary lead guard and a secondary ball handler.
Second, once you get to one and done tournaments, you have to be able to play in the half court at some point. And especially when it gets to better teams.
Also, efficient offense, using high pick and roll (like every other team in the universe), whatever concepts we run out of that, will *feel* fast pace if we execute.
Offenses feel slow when the initial action is corrupted and then it falls apart and contingency concepts are awful as well.
Make offense feel simple, it will feel fast.