I know my experiences in JFK are somewhat anomolous, but in the last couple of years - perhaps a couple of dozen arrivals into T7 (UA) - the longest it took me to clear both immigration (with or without the INSPass working) and customs was perhaps three minutes: seriously. I only have carryons (I keep my longterm stuff overseas), and am usually within the first batch of 10 or 20 people to deplane, so the lines have not formed. 99% of my arrivals into JFK are from Asia.