To the best of my (or maybe lack of) knowledge, if its FPS lag, just turn down some settings. If its server lag. Get up, turn off your computer, unplug everything from it, grab your keys, drive it to Frys, go in, get a Butterfinger, get back in your car, go to a grocery store, sell the Butterfinger for a profit, repeat as many times as needed until you can get a better internet connection. After you do all that, bang your head on your desk as many times as you can because that did not solve the problem.
(I have no idea, waiting for someone smarter to speak up)