I was on a low population server - RU 3942
A zombie cam running at me and firing a gun (silenced SG5) didn't work at all /
game started lagging.
I ran away into a building, changed guns (to a silenced FX45) and when I started firing the screen just froze in place.
Meanwhile I am firing with no result.
Game flashes back and health is red - I hear some shots made seconds ago
then I'm dead.

This bug makes the game completely unplayable.
I won't be playing until you make an official announcement that it is fixed.
Seriously dude you should never have released this out of testing.