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reaction times have nothing to do with any aspect of your ET....you could sit there for a few minutes after the light turns green, then launch, and it wont make a difference in your ET numbers. the only correlation between you RT and ET, is that if youre very shallow into the beams, you could argue that you have more of a "run" at the beams before the ET starts...but we are talking about a difference of a few inches...some people also "deep stage" because they feel that it is better to be that much closer to the finish line, but in my experiences, the few times i have had problems and gone deep, i red lit.