Problem solved by rolling the AMD Catalyst driver back to the last version Samsung provides for my laptop (13.152). I kept the latest Intel driver I installed through the workaround though.

Thx nonetheless for your help.

The AMD Drivers already were the most recent available on the AMD website. Following your suggestion I installed the current drivers from the Intel website, which required a workaround, since the installer told me, that the driver isn't validated for my laptop. The last validated driver was the one that the DxDiag.txt shows.

Sadly installing the newest Intel drivers brought no improvement. I added the current DxDiag2.txt to this thread.

The issue disappears when I select "power saving" for "dayz.exe" in the Switchable Graphics Tab of the AMD Catalyst Control Center. Of course the game then runs on the integrated Intel HD 4000 which isn't really enjoyable either. The distortions reappear when I switch back to "high performance".

So I suspect the problem is with the AMD switchable graphics functionality. I uploaded the requested file - I hope it's the right one. If I can provide you with any more infos, just let me know. I'll monitor this thread.

Indeed I haven't had any crashes recently. Well done!

Maybe I am to stupid, but is there anything I can do as a Steam user to change the version of Arma 3 I am running? Thx for your advice

I had the exact same problems kinda often. After walking for 300m or so my charcters pace is reduced drastically. If I press "shift" for sprinting my character sprints the usual 150m and then starts to move very slow again if I release "shift" then he starts to run again for a few meters, then goes very slow again and when "shift" is pressed he walks (not sprints - because hes exhausted from the first sprint) at a normal pace - this stuttering goes on until I use a vehicle (or of course die).

It's definitely a bug (maybe already reported) but until its fixed it helps to get on the vehicle on the DRIVERS side, get out again and then you should be able to pick up weapons and the binoculars.