Rooting itself doesn't change anything except your access. So, the answer to your question is no. However, it WOULD allow you to overclock to a higher speed with a different kernel.
I've rooted and updated kernel and rom. Everything works perfect. Even fixed the audio out/phone issue (when you have your phone plugged into the aux out in your car and take a phone call, the other person can't hear you if you answer and leave it plugged in).
GPS fixed, audio fixed. Took some tinkering, but it's great.