This makes no sense to me. Spoken English does not reach 10 words per second even in New York; to hear it, even inwardly, would be to hear a jam of syllables with no respite and hardly any time to parse out the phonemes.
no respite is a matter of practice. time to parse the content is not that hard if you've already learned to RSVP faster.
you're basically denying what you don't know how to do, for no apparent reason.