From the Guinness Book of World Records:

Fastest rap MC
Ricky Brown (USA) rapped 723 syllables in 51.27 seconds on his track "No Clue" at B&G Studios, Seattle, Washington, USA on 15 January 2005.

http://www.guinnessworldrecords.com...?recordid=50916

and before him it wasn't twista, it was Rebel XD in 1998 (which was last time the record was changed)

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