I am going to call all of the horse shit on this one, I certainly can tell a difference in my board smoothness and speed after a good wax compared to 4 trips up with no wax.
I have always figured waxing the base protects it, keeps it moisturized, fill in all of the little cracks and gouges, and keep it from wearing down so fast.
Call it all you want science already proved what I know.
That friction and slowness you're feeling is probably base burn which means you should just go have some structure put in.
You know what I'm going to do opening day? I'm going to slap some bindings on a deck I rode over 70 days that hasn't seen wax since it hit the belt waxer at Elan. I'm going to go ride and get down the hill just as fast as everyone else. Poor craftsman blames his tools.