My most recent event I concentrated on starting slow, and getting into my pace in the water. I actually finished in the top third of my age group in the swim, because while my stroke is slow, it is also efficient. I really have to work to avoid the adrenaline rush when the gun goes off, and the sprint into the water. Works much better for me to jog in and start a nice easy stroke, and pass the guys who are out of breath and swimming with their heads up (which often describes me).