If you right click on the desktop shortcut for the game, under the compatibility menu you will find the option to disable it. Hope it helps!
Printable View
By the Twelve, I turned off Fullscreen Optimization, like...years ago? (playin since launch) for similar issues. I did notice awhile back that I was gettin the odd hitch here n there and my GPU temps and utilization was higher than normal. I run Vsynced at 60 just to keep temps down and my monitors, though very good for image quality (pro quality IPS, 10 bit colour etc) are only 60Hz. However when I see these issues I will unlock and see what my max is, was barely breakin 80 FPS on a GTX1080 max settings 2560x1440. Didn't fuss much over it since I'm real busy irl and synced it never really bothered me, thought mebbe it was due to an update or summat and thus unavoidable (old system, decent GPU). Dropped HBAO to Strong from +Quality and moved on. Saw this thread, checked settings fer ffxiv_dx11.exe and sure enough...ENABLED. Poor form MS....poor form. Anyhoo, fixed that n FPS is up to 125ish in the same zone....so, thanks? I was actually gonna rebuild my base system soon, going to rag it out a bit longer now xD
I have to Admit game runs a lot smoother now, BUT still getting HUGE fps drops. CPU and GPU load is normal HUGE FPS drops to below 10 fps but actually higher FPS when it normal. over 140+ fps. so that kinda good. this is now just an issue I get when im in an Instance/dungeon . :(