Several years ago, after much practice and discussion with some very good Filipino Martial Arts (FMA) practitioners, and some timed and measured cutting/striking drills, I came to the conclusion that what I consider a decent Kali fighter can cut or hit about 4 times in a second, a good fighter can do about 6 per second, and what I consider really good is anything 8 or higher. In my opinion, though, I only really count it as good if the cuts/strikes are delivered for at least three or more seconds continuously, if the live or empty hand is moving to be in a position to check an opponent's motion, you are moving your body into advantageous positions and are thus doing footwork while striking/cutting, and the strikes/cuts are targeted rather than random hack and slash. So, if you are fast and jerky, only move your weapon arm and flail away with random and awkward "hits" and your feet and body stay in place, then you are "gaming" the training and will not be able to do well against a resisting and even semi-trained opponent.
Look at a bit of the movement from about 1:59 in this clip to about 3:00:
There is some speed and some explanations of usages of the Rock Salt. Please note that this is not full speed.
Look at the end of this video on the Spyderco Barong for some speed:
This is also not at full speed and is done with my left hand. You need to be able to use both hands in this kind of movement. In case anyone is wondering, I don't usually go full speed on camera because, with my cheap camera, the motion blurs out a bit too much.
Interesting topic, Doc, and one that I recently discussed with a couple of students. I just recently did a live demonstration at the request of a local police chief and went full speed with a Spyderco Endura trainer against one of the chief's officers (who also is a member of my law enforcement task force), and it proved interesting to the observers. I think I may use some marking ink and a trainer against a white T-shirt in a demonstration video thanks to this thread.
I was wondering what my next video was going to be (aside from some interesting close range work with the Balance that Ed just sent me).