Tried with and without mods, changed to performance branch, tried 32bit version, verified game cache, re-installed (and re-downloaded) Arma, re-installed Windows 10, tried an older graphic driver (378.49) and the latest.
Hardware:
Asus Z170 Pro Gaming Aura
Intel i5 6600k (OC to 4.5GHz)
Gigabyte NVIDIA GTX 960
Arma installed on a SSD ofc.