I think there are various hazards in orbiting in the circuit in addition to loss of speed, such as blind spots in the turn and ultimately flying for a short time in the opposite direction to the circuit. there are other things that can be done in anticipation such as extending the heading on the initial climb on runway heading or extending the downwind leg, but one tecnnique I suspect is rarely taught or exercise is slowing down, flap one, reduced power and hence lower airspeed.