I'm not sure you are aware of this, but appearently the netcode still has issues when there are too many players in each others bubble at the same time.
I was with 2 friends and it was the exact same for them, so it's not on my end.
It was on the official vanilla DayZ server <<<DayZ NL 3664728 HC (Public) - Hosted by Multiplay.com>>>
We were on the NWA where we heard shots, so that's how we know there were many players there.
On our screens, we would run in one position for 1-2 sec and then be shoved forward where we would come to run in position for another 1-2 sec and so on.
I haven't seen any player lagging since the "NEW DAYZ" and so I'm very surprised and shocked this is still a thing.
When we moved away from the NWA it got slowly better and better until it was no more at some point. Hence the theory of it being caused by too many players being in each others bubble.
I hope this issue is on you radar, or at least now. Thanks alot.