Marklooper

I spawn at the airfield like everyone. I did some pvp there and the general performance was pretty well. I came across a lot of bug that the team I think already knows but the big issue for me it was when I tried to get a vehicle for a spin. I decided to go to Berezino. The Major issue for me was that after 5 minutes of driving my game became very laggy with horrible stuttering and major fps drops. Especially driving inside towns was totally unplayable. I restarted the game and this time I was watching the performance of my system on the task manager. When I entered the car my memory usage was at 70% with the only 8gb I have. After 10 min of driving I was at 95% and the game was unplayable again. My system is not the best I know but normally its ok to run dayz. I have an I5 4460 GPU is an MSI 970 4gb and 8GB ram. Is it normal? Even when I put everything on Low I had the same issue. When I play on exp I have no problem and I have good fps even if play on Extreme sets. So enyone else had fps drops while using the vehicles on stress test?