All but length I suppose. Diameter would definitely increase the conductivity of a wire, that's why jumper cables are so big, to conduct very large amounts of electricity. Also decreasing temperature allows for a faster flow of electrons causing better conductivity. Finally, Gold is very, very conductive and would be used in wires everywhere if it weren't so expensive(that's why copper is used a lot instead) also gold is quite delicatewouldn't want to bend it back and forth a lot like most wires but simply put, yes. Gold would also very much up the conductivity.