Ever since the push to 0.55 stable I've been having terrible desync on most or all servers.
Doors open seconds later, he won't change weapons, reloading comes with seconds delay. I'm surprised I was even able to shoot three people ever since. Everybody is teleporting all over the place.
This is not an internet issue. A lot of players have been experiencing this. My ping is great. 95% of all players have desync in the player list, ranging from 2 to 19000. That makes me since this is a server-sided or game-sided issue.
The problem is that with the glitchy super-zombies, sometimes you don't stand a chance. I'm running like hell away from them but keep getting rubberbanded or teleported somewhere else, where they whack the crap out of me.