This is a bug I've experienced with three seperate vanilla servers running 0.54, as well as several servers from 0.52 and earlier running PySpades.

It's teleporting. Not watching other players teleport due to lag, but having yourself teleported to where you were several seconds ago (also likely due to lag). Prior to 0.54 I only experienced this problem with PySpades servers, but it's now a problem on 0.54 servers running no third-party software of any kind. I also experienced this glitch with the leaked version 0.53.

It's a anti-hack detection. It's either the server is lagging, or you are lagging, that's why you teleport.

Oh... associated with the anti-speedhack features in PySpades and now the 0.54 updates? Makes sense.

Still, I dislike it, and think it needs to be fixed... I've died a few times because I teleported back out of cover.

i'm seeing choppy bandwidth usage

full server incoming seems pretty steady but outgoing is constantly fluctuating +/- ~700Kbps

also, watch out in pyspades servers, because this lagging could get you banned!

you dont get autobanned if the server detects hacking. only the admins can ban.