Baseball is indeed a slow sport, but instant replay will simply replace—rather than add to—other aspects that contribute to its snail-like pace.  First, every time there is a controversial play where the umpire might have made a bad call, a player or the manager will come out and argue with the umpire. This arguing takes up about as much time as a video review would. But with a video review, there would be no arguing; everyone would know the umpires got it right.  Second, when an umpire is not certain about his call, he often will confer with the other umpires in a collective attempt for them to arrive at the correct decision. This, too, takes time, and this, too, can be replaced with instant replay, which has the added virtue of being more accurate.  Third, not very many plays will require instant replay, so even if there is a dilatory effect, it will be relatively small.  Finally, if baseball’s pace is such a concern, then MLB should first pursue a host of other steps to speed the game—time limits for pitchers, batters, arguments, seventh-inning stretches, between-inning warm-ups, etc.