I talk very fast, especially when caffeinated. From discussing this with people in my life I have come to believe that I speak via a different mental process than some other people. Which is interesting.

Namely: my verbal brain races ahead of the rest of my brain, and seems to think better than my internal monologue. It seems smarter and better able to make connections than when I think on my own, as if my brain is wired in a verbal-first way.

From speaking to others I think there is some discrete variation in this property. Some people's internal monologues, or maybe it's their 'writing' brain, is more heavily wired into their intelligence than their verbal brain. Some people speak slowly and deliberately and dislike fast-talkers because they run a more complicated mental process to formulate and process language than I do.