I may have written one or more of the articles you mention, however I did not write about caplocks. That was another writer.
All flintlocks are not alike. A well built large Siler that I used for many different testing sessions averaged .0388 seconds. The fastest flint I timed was an origional Joseph Manton owned by the late Lynton McKensie. It averaged .0277 seconds. Most flintlocks fall in the range from .0400 to .0600 seconds. It takes careful tuning to get a flint to break .0400 sec.
Percussion (side)locks that I have messed with hit a range from .0200 to .0250. Percussion are faster, but as others have said, our human senses cannot tell the difference. I have not timed a mule ear percussion, but would speculate that it would be among the faster percussions.
I have a large Siler coming my way that may be the fastest reproduction lock I've ever have the pleasure of timing. I'll report back.
Regards,
Pletch