The throughput of a road is car density * speed. So from a pure throughput perspective, the ideal driver is a tailgating speed demon. To maximize time spent at high speed you should also floor it when the light turns green, and slam the brakes at the last possible moment when it goes red.
One thing I forgot to mention, braking as late as possible doesn't help you at all, but it does free up road space behind you, which can let people behind you get through an intersection they otherwise wouldn't.
