this is a boring one but the mobile passport control app has saved me a few hours in line when arriving back in the states. You fill out all the info for you and anybody you’re traveling with beforehand and once your plane lands, you provide a picture of yourself and I assume it confirms your location. Often, but not always, there is a separate line for mobile passport control that is so much quicker because you’ve already filled out your customs form on the app and a lot of people don’t necessarily know that this is an option. Hope this is helpful.
