I tend to line dry or put nappies on an airer next to a radiator but we have hard water and i do end up popping them in the tumble drier for tens mins at the end anyway just to soften them up.
I personally wouldnt tumble pul/pocket nappies though, i only do bamboo fitteds and inserts in mine... Too worried about wrecking them
I used to have tumble drier balls (spikey plastic things) which are supposed to help dry things quicker, we stopped using them as they made a lot of noise