Found a cargo truck today. Was driving it in third person and it crashed several times due to lag/desync - even got to the point that the game locked up my computer and I had to reboot by forcing as Dayz would not close with task manager. Even the infected zoomed past me. My FPS in third person is 5-7. I tried switching to first person and was able to get between 20-30 fps and had no crashes.
However, when my friend was driving the truck, my character froze at 1 fps, he stopped to let me catch up, which happened eventually