Scaling keys is pretty easy all you do is make sure all your joints are selected in the hypergraphe then move your cursor to the time line press and hold the shift key and hit and hold the left mouse botton and move the mouse to the right. If you did it correctly a red line will form in the time slider. Now in the red area you will see little black arrows. The middle ones are for moving the keys around and the out side ones are for scaling. With your animation if you want to speed it up, click on the arrow on the right not the middle right one and move it over to the left. That should scale them down an make your animation a bit faster.

Kurt