My husband and I play Dayz together and were in Zelenororsk, in the fire station and we were getting extreme lag. I saw him frozen on a number of occasions there. And I was having issues as well. He could not even log out. It restarted the app itself and it seemed better for him. When we tried leaving the area through the Zeleno Military Base, it froze my husband in a gate and he was not even there on his screen. Then zombie after zombie came and attacked him and he couldn't even see what I was seeing. I was also getting attacked, but couldn't see any on me.
Normally when we play together we have no issues, unless in a big area we get some lag. We have also been to this place a few times already with just minor lag. I checked the internet connection and that was fine as well.