Eminem's song "Rap God" has a segment where he goes at about 6 words per second (@4m23s):
* https://www.youtube.com/watch?v=XbGs_qK2PQA
https://www.youtube.com/watch?v=tohDycgc-H8
However, there is a difference between a rehearsed and practiced performance and communication that makes these things more a feat of acrobatics.
* FedEx: https://www.youtube.com/watch?v=NeK5ZjtpO-M
* Micro Machines: https://www.youtube.com/watch?v=Gzd11GMBONg
* https://en.wikipedia.org/wiki/John_Moschitta_Jr.
https://www.youtube.com/watch?v=tohDycgc-H8
However, there is a difference between a rehearsed and practiced performance and communication that makes these things more a feat of acrobatics.