Back in 2004-05 Deen was ranked by either Modern Drummer or Drum (can't remember which at the moment...) as the fastest double-bass drummer currently playing professionally. And if you've heard any of his stuff with Joe Taffola it's really not surprising. Journey's catalog is by far the tamest he's ever played professionally. When it comes to speed metal, Castronovo is part machine and part animal!
HOWEVER....
THIS GUY, holds the world record for double-bass kicks with 1530 strikes in 60 seconds!
Granted, this is simply making contact a whole bunch of times in a given time frame - there's no rhythm or style to it but still.... DAYUMM!!
https://www.youtube.com/watch?v=hUeF8pbhj8A