Problem is, and go ask around the community, that half the players playing ZA1 and 2 have horrible lag. This is either server performance itself, or ISP related, I would'nt know. ZA3 and 4 are smooth as silk. Heck, it's even discussed on the Dayz South Africa Reddit page.
Then again, it's been a while since my group has played on Za1 or 2 so this could have been rectified by now, we pretty much only play Lingor now.

