If you are really in a rush, then one of the best things to do is choose which line you enter carefully. While you may think that it won't make too much of a difference which line you go into, that isn't the case. Keep an eye out to see which line is moving faster before you choose which one to go into, and make sure that the people in front of you are the "quick type."
The "quick type" travelers are the ones who have a smaller amount of suitcases and people who look like they have their documents and things in order. There will be less delays that way.