As you leave the counters you will go to the right "behind" the international check in counters.

It's the "south" checkpoint.

That said the line there is often slower then the main checkpoint IMHO. They have several things at that checkpoint ("expert, elite and precheck" And very few "screening" points.

SO read the sign telling you how long the line is before you assume "it will be faster"

I only go down there for precheck. If my "random" number doesn't come up I hike back to the main checkpoint.