People tend to check in during these times:
Make sure your phone is fully charged and you are well fed- this may take awhile
If you go in after noon on weekdays there's no line and no patdowns
To get in and out quickly, line up at 8:15 before they open at 9am. Earlier than that won't save you much time.
Very clean men's room :-)
Holy shit, the whole office operates in Cantonese
Came in advance (40 mins before) to be served fast
Going from 1-2pm on a weekday is faster than any other time.
Comfy chairs, lots of elderly Chinese. Make sure you have all the right documents!
Make an appointment online first. Waiting for 1hr+ sucks. Prepare to get patted down by security too.