This is something I've noticed a lot while playing DayZ. I've sat two computers next to each other and viewed how on one screen the player would stop and it would take 1-2 seconds for the other game to do the same. I've seen this on multiple servers and on different connections. Additionally, sometimes players would randomly run into walls continuously and disappear and suddenly show up again. As for the zombies it always takes a second or two for them to die after being shot multiple times, this also applies to players. Here is an example how this effects gameplay: I shoot player in face 8 times, nothing happens, a second later we're both dead. Smooth gameplay should be a high priority for the developers.