United Gates at A have a serious problem with egress at crowded hours. People who don't want to walk at a normal pace will walk slowly and there's just not a feasible way to get around them. I guess they assume any emergency would divert people out emergency exits in the SIDA as well forcing an eventual closure/screen/push to everyone non-sterile area, or otherwise it wouldn't be allowed to operate.

The new bins at C definitely help processing over there. Terminal A when I arrive the lines are generally quick regardless going in (less than 5 minutes to clear with Pre, generally 3 or less people before the doc checker)