Quote Originally Posted by Chocolys View Post
When running "Borderless Window" mode, the game will be sync to your Windows 10 Desktop settings, because the game is still running in a Window even if it occupies the fullscreen with an invisible frame. Basically the display will be managed by Desktop Window Manager
Since one of your monitor is set at 60hz, Desktop Window Manager is vsync at 60hz. When you set in Final Fantasy XIV settings: 144 fps (refresh rate 1/1), because of the Desktop Window Manager it will be in fact Refresh Rate 1/1 = 60.

What you might try is set "Frame Rate Limit" to none. Since when in "Borderless Window" mode, Triple Buffering is forced by Desktop Window Manager, you should not experience visual tearing issue.
Appreciate the reply and assistance! Yes, if I set frame rate limit to none, it will not limit it at 60. But it goes way over 144fps and generates needless heat.
Guess its time to look for another 144hz monitor.

I'll see if there's some workaround to this.