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It’s a direct response to the escalating strikeout rate, where you’re giving the hitter approximately one one-hundreth of a second of additional time to decide whether to swing at a pitch, which has the effect just in terms of reaction time of reducing the effective velocity of a pitch by roughly 1.5 mph, the purpose of the test and hope is giving hitters even that tiny additional piece of time will allow them to make more contact and reduce the strikeout rate.