Impossible to say, i dont know the game well enough to have an answer for that, if anyone knows it would be Greg Pop' he' seems to allways find a great balance of playing hard and resting his team just the right way for the playoffs
From a fan's perspective i dont think we have played our best basketball this season thus far, but i think your question is in more broad terms eg. "are we using to much energy to early in the season" and again as a fan' no! i want us to be dominating, i dont want the bulls single season record, i just want the number one seed, and right now every game counts.
A better question in my eyes would be "in witch game has the Celtics played closest to perfection?" by that i mean the current core of Celtics. Think Rondo's triple double game with every other starter peak'ing aswell?
Come to think of it' that would be hellah awsome to see what this core 5 could do to any good team when everything just clicks in one game.