In terms of ball speeds lawn tennis will register faster; Andy Roddick serves the ball at 155mph. The ball has a long way to pick up speed and the racquet is engineered to be able to hit the ball very fast.
However, in terms of game speed, Table Tennis will be quicker. Games are for fewer points than in lawn tennis, so in terms of time you're looking at less time to get to a win than a professional tennis game, which can sometimes last for hours. Also you could argue the game looks quicker; given the shorter length of the table there are more hits of the ball and it goes back and forth more often.
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