The fastest I’ve run are Schwalbe Kojaks – easy to get on and off the rim, protection strip, very light and comfortable in the 2″ version. Not too expensive either. I like them lots.
If I wanted something a bit more off road capable I’d be looking at kenda small black 8’s – I’ve not double checked, but I hear they are recommended up to 80psi.
Edit – The only other thing I’d mention is that running tubeless may not allow you to run the higher pressures you’d want for the road. For example if you were running Stan’s rims that only allow up to certain pressures when run tubeless.