Slowdown during multiplayer

[SNeddie]

So I played Mario Kart Double Dash with my wife for a while and Mario Party 4 with zero lag/slowdown, fast forward to several hours later when my friend comes over and I tried to play Double dash with him and it was so slow that it made the game unplayable. Also happened with Mario Power Tennis, a few other multiplayer games and Zelda Twilight Princess.. What can I do on my pc to make these games run smoothly?

My Rig:

MacBook Pro late 2011 running windows 8.1 (64) through Boot Camp.

Intel i7 2.2ghz
16 GB Ram
AMD Radeon 6750M


Any help would be appreciated.

[DJBarry004]

Before booting ZTP, enter the game´s properties and enable the Hyrule Field patch. About the other thing, multiplayer mode makes even the most lightweight of games to hardly go full speed.

Try enabling TurboBoost and make sure your CPU doesn´t overheat when playing.