Improve clubhead speed
Q: I need a good drill for developing a better lag with "the move" toward the ball and complementary improvement in clubhead speed.
A: "Lag" is a word used a lot in golf, and would just as easily be replaced with the word "sequence." The correct move from the top to improve clubhead speed is the weight shift to the front foot, leads the unwind of the hips, the unwind of the hips leads the shoulders, the shoulders lead the arms and hands, the arms and hands lead the club. Think of starting the downswing from the ground up, eventually dragging the club through.