The juggling act is accurately predicting when the light will change and the cars in front will begin moving. Brake too much, and the light will change before you get there, and you will have to accelerate, and possibly cause people behind you to miss the green light. Brake too late (or too soft), and you might end up stopping at the light.
If you have a very good idea of when the light will change, it's most efficient to brake very hard early on, reducing your speed to what will perfectly coast you to the light as it changes.
Be mindful of those behind you though. Most people are in a race to the red light, and won't be prepared for "some whacko nutjob" who brakes early and coasts to the red light.
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