So I 've been experiencing lagging while playing the game.

If it is in fact because your timer is hitting 0 seconds and nothing happens it is because the opponent has quit the match, as others have already mentioned.

If you experiencing lag effecting your game play where animations are slowing down the game there are a few things you can do to try improve this. The first being is lowering the graphics settings tot he lowest possible. This will help the most. If lag still occurs try updating your java to the most current version. Lastly right click the game window and hit settings. Check the box "enable hardware acceleration". All these steps should improve any animation lag you may be getting.