Thank you for the response!
Actually, I haven't played Arma 3 online yet. I already get the latency issues when I am in singleplayer. Strangely, multiple drivers seem to cause dpc latency Problems (nvlddmkm.sys, Killer Network Driver). I'm afraid I can't download the tool as you suggested in step number 2. Google Drive tells me that the file is infected. Could you just give me the name so I can find it online myself? Also, are you sure about the network driver? My motherboard manufacturer recommends a different one on their website:http://www.msi.com/support/mb/Z97-GAMING-3.html#down-driver&Win10 64