Bad performance in Borderless Fullscreen Mode

[Elysium]

This isn't an answer, however games work best in full screen - this one included. If it's not, that might point to a larger issue > Drivers, Vsync settings, frame buffering, pre rendered frames ahead(this one in particular might alleviate stuttering if raised).
If the game degrades over time - and we can't isolate it as a game only issue - than it's a memory filling issue e.g. GPU running out of memory. That's suspect though, I'd be hard pressed to believe that a single monitor setup at 1080p takes all 2GB.

What are your in-game settings under system configuration and what of your Nvidia control panel settings?

My Nvidia Settings are all default and using the 326.80 driver.. MB drivers up to date also and Windows update full

My in game settings are all maxed out except for Shadows Normal 1024p.. enabled LOD and Occlusion Culling for better performance.. 1920x1080 60hz

My framerate is really good all the time.. 60 fps even with lots of people with some drops when there is extreme action on screen.. but the stutter is the main problem.. in Fullscreen the game have less stutter but the camera movement isn't smooth that's why I play in Borderless Fullscreeen

[Ranebow]

My Nvidia Settings are all default and using the 326.80 driver.. MB drivers up to date also and Windows update full

My in game settings are all maxed out except for Shadows Normal 1024p.. enabled LOD and Occlusion Culling for better performance.. 1920x1080 60hz

My framerate is really good all the time.. 60 fps even with lots of people with some drops when there is extreme action on screen.. but the stutter is the main problem.. in Fullscreen the game have less stutter but the camera movement isn't smooth that's why I play in Borderless Fullscreeen

From what you're describing you could have a frame buffer issue in Full Screen. In your Nvidia control panel, under Manage 3d settings there is a setting titled 'Maximum Prerendered Frames' Try adjusting this to it's lowest value and testing for any difference in Full Screen. If no change or it's worse, adjust it to it's highest value and try again.
Make sure to Apply settings and you have to rerun FFXIV each time for them to work.

This does not point to a resolution on why Borderless windowed mode has degradation. It could also be fragmentation of the hard disk? It might manifest itself as a problem in full screen because the game is caching differently. Or are you using an SSD?

[Elysium]

From what you're describing you could have a frame buffer issue in Full Screen. In your Nvidia control panel, under Manage 3d settings there is a setting titled 'Maximum Prerendered Frames' Try adjusting this to it's lowest value and testing for any difference in Full Screen. If no change or it's worse, adjust it to it's highest value and try again.
Make sure to Apply settings and you have to rerun FFXIV each time for them to work.

This does not point to a resolution on why Borderless windowed mode has degradation. It could also be fragmentation of the hard disk? It might manifest itself as a problem in full screen because the game is caching differently. Or are you using an SSD?

I'll try the Maximum Prerenderer Frames and post some results.. but it was on Use Application Settings by default.. I defrag my HD ( is not and SSD ) all the time and this is new rig.. no more than 1 month and with all new parts.. my other games work normally and FF also.. except for this Stuttering when panning the camera in Fullscreen and the stutter all the time in Borderless Fulscreen