As of the latest update I'm having some severe graphical issues. However, those will only occur when it's dark/night time in the game. The game will produce lots of graphical artifacts (tiny white lines and squares). Alt-Tabbing out of the game and checking my GPU temperature (via SpeedFan) revealed a significant increase in GPU temperature as compared to playing at daytime (about 85°C, which means +6°C ).

Switching back into the game produces what you can see in the attached screenshot permanently.

While I know that this might also be an hardware issue not related to Arma 3 at all, the suddenness of its occurrence and the fact that it only happens under those very special circumstances (and only in Arma3) might be reason enough for the Arma devs to look into it.

The game runs very smooth and without any issues at all when playing at daytime on very high details for me. I also haven't noticed this happening before the latest update (though it may have been there before) {F18504}