Lag on Xbox Live

Quite often when I am on Xbox Live I experience Lag. Sometimes the Lag is hardly noticeable and sometimes it is unbearable. I know that my connection is terrible at times and that sometimes is the causes of my lag. What drives me mad is the fact that people intentionally tamper with their connections, using a lag switch or something else, in order to give themselves an unfair advantage. I know that there are other factors that attribute to the lag on Xbox Live too.