Focus on correct technique and hitting the ball straight. Gaining more clubhead speed and plowing 20 more yards only to add a huge hook or slice putting your ball into the tree, hazzards, OB, etc, is completely useless. Once you have a solid, repeatable technique, you can then work on increasing clubhead speed, if you really think you need to. My opinion is that there is nothing wrong with your swing speed. If that is the speed that is natural to you, you will encounter countless problems trying to speed up your swing.