Flying faster is the worse thing to do while training. You are flying point to point like a missile instead of like a plane. Your control is not precise it is more of a correction along a heading. I have had some of my students shooting approaches and after they missed a few they get back into the pattern again at high speed for a go around only that by the time they slow down they have already messed up the approach with there speed and they get agrivated and go around again at high speed again. No learning is done doing this. I usually take control back and fly for a few minutes until they calm down. High energy and high speed are advanced training after soloing a trainer or for performing some basic aerobatics like a loop until you are coming down the backside of the loop