That is an interesting statement, "but isn't fast"
Muley, it's been my experience that if one is use to shooting a caplock, it takes a few shots with their flintlock to realize the flinter is also fast.
I think it's more of a mind thing then anything else as we have that instant puff of white smoke as the powder begins to burn in the pan, then after a few shots we don't even give it a second thought as we're fully committed to concentrating on our sights. I've noticed this with not only myself, but several friends over the years who also shoot cap and flintlocks. I'm to the point now that part of my flintlock ritual is reminding myself to concentrate solely on the sights when taking that first (and all) shots with a flintlock. After a few shots it just becomes second nature and we don't even realize we're shooting just as normal with the flintlock as we do with the caplock.
Hope I explained that right / or at least my take on what "but isn't fast" may mean.
Rob, I would call your flintlock "fast!"