Move in the same direction you are involuntarily moving in. This happens when you are moving while trying to perform another action, so the movement locks. It's a helpful glitch when trying to run long distances, though. >;P
Adjust your video resolution in game until you are at a point that graphic lag isn't the issue. Play with the distance as well. It took me some tweaking till I got it just right. Try playing in windowed mode and playing in administrator mode as well.
Allow the game through your firewall or play with the firewall off... Derp. You don't really need a firewall when playing games, not like an uber hacker has it out for you or anything. Plus most viruses are gained through DLing objects you allow through your firewall anyways. I have these ports open for DayZ: 2302-2305 TCP/UDP 47624 TCP/UDP 28800-28900 TCP/UDP