the lag is controled by the type of computer and the amount of space that your computer has! Also in your games you can add anti-lag scripts that will help do that, to add that either make one or get one from free-models!
By lag you mean internet lag? Or graphical lag? If you mean internet lag, then the only thing you can do is to make sure no downloads are running while playing the game. If you mean graphical lag, you can try lowering the settings or closing background applications like the anti-virus.