Do You Understand the Words Coming Out of My Mouth?

After a foreign (English as a second language) co-worker told me that he can't always understand me because I speak too quickly, I polled my friends to see if I habitually talk too fast.
Here's what they had to say:

TAG:
No

LAB:
No you speak lucidly and at a properly measured pace

JAL:
You speak rapidly, but not too rapidly

ENP (who types like I talk!):
Yes you speak quickly but i always know what you are saying

at least you aren't boring
i mean, ppl that speak really slowly...sometimes i get f*cking annoyed

so, i don't mind it, it's part of who you are

i talk prob like you though, esp when you get excited, it all just comes out

it's the hard part of having a fast brain

Not much of a consensus!
Have you ever met someone who has a lisp but is blissfully unaware of it? (Be honest, folks.)
Despite vocalizing being SO integral one's daily existence, people tend to be very unaware of what their voices and speech patterns "read" as.

Just some food for thought...
Cxx.