It is interesting, when i speak faster many times I do reduce my stutter, I believe it might have to do with processing my thoughts faster into words and delivering with out the fear of stuttering. Also, if I do speak quickly I am usually in a better mood and more chatty. When i speak slower I think slower of what I'm going to say and I take my time with words, this some times works but I get tripped up by the first letter of the word I'm trying to say. In my case, speaking faster some times works better but it does not work in t's entirety, I still end up stuttering.