Say what you will, but I swear I think he smokes weed before some games. If you go back and watch (I think) the home game against Chicago, when he was being interviewed (by ESPN) before the game in that little room with the black curtain in the background he was certainly high, no question in my mind (I know a cooked person when I see one), and it seemed to be lingering throughout the game and less of an issue in the 4th quarter.
I know it sounds ridiculous, but it explains his hesitancy and lack of quickness.
On another note, his release is consistently timed late and as a result the ball hits the front rim. His legs look weak and he is definitely still dealing with a foot injury.