But why does it take longer? There are some stores where I'm just as fast to self-checkout as a human cashier, and others where it takes a ton more time, becaus

But why does it take longer? There are some stores where I'm just as fast to self-checkout as a human cashier, and others where it takes a ton more time, because the machine is super laggy. (Or deliberately made sluggish?) You're literally doing the same thing as a cashier, using the same equipment - as long as you don't suck at scanning things, it should take exactly the same amount of time.