I find the biggest time sucks are: A cashier who can't take payments fast, and a customer who can't pay fast. Someone who doesn't know how to work their credit

I find the biggest time sucks are: A cashier who can't take payments fast, and a customer who can't pay fast. Someone who doesn't know how to work their credit card adds a lot of time. Based on just being observant, I've got a general intuitive sense of when the people in front of me might take a long time to pay. I look for people who seem unaware, in a zombie-like trance, shuffling their feet along the floor with their eyes blurred off into nothing. It's a pretty decent judge. For cashiers, just waiting in the line a moment usually gives a good idea, and I'll move lines if I'm in a hurry and the cashier appears new or particularly slow.