Head to the airport at least 2-3 hours before your flights if you are traveling during peak season (Xmas, April, November)
There is security check going into the airport, they check all bags
The security after checking in only had 2 lines and 2 screens, and the staff are quite slow
The passport control also is very slow. They open more windows sometimes if the lines get too long, but still, very very slow.
We travelled mid Feb so not really peak peak season (but lots of chinese as they are finishing their New year holidays) and it took us 1 full hour after checkin to being at the gates