Make sure that the protective layer of plastic is taken off of the game.  If you are using tape on your hockey stick this will cause the game to slow down.  Also, applying too much zero-friction ice spray will also cause the game to slow down as it builds up.  If the issue is too much spray you can clean the game using the Mr.Clean Magic eraser as following. Get the eraser damp and clean the whole surface of the game, then dry off with a soft cloth. Reapply three squirts of the spray to both halves of the ice surface and wipe around with a soft cloth just like waxing a car.