The fastest boarding and deplaning I have experienced is at Burbank airport. It is done with 2 open doors: front and rear - rather than just 1 door boarding only front to rear.
I'm sure it is the same at other small airports as well...
Do you exit to the tarmac or did they have two jetways? Two jetways make sense but you need the plane to come in horizontally. Might be a good idea for new airports.
I'm sure it is the same at other small airports as well...