Hmmm, what exactly is Hubitat changing if it’s not configurable by the manufacturer? Could Hubitat be adding its own delay and that’s what you’re changing?
I use ST and the default also feels slow. I’m getting used to it but would much rather have a faster response. It also feels decently slower (all relative of course since we’re in seconds category) than the GE I have controlling a switch beside it and that also has the double tap functionality so hopefully, a firmware update would increase the speed.