There are really many people with fps issues since the windows update.
I, myself cant figure out which solution works for me, I can't practically play anymore in borderless mode, it occasionally locks my framerate at 30fps(which is not really playable) even though it is set to lock at 60 fps. It will stay at 60 fps for some time until you open a menu or change an area, then it suddently drops to 30 and stays there until you change graphic settings again. For me only fullscreen mode fixes this.
I played borderless window for some years with no problems.
There were also some more recent threads on reddit about this...
https://www.reddit.com/r/ffxiv/comme...uns_at_30_fps/
https://www.reddit.com/r/ffxiv/comme...o_30_fps_only/
https://www.reddit.com/r/ffxiv/comme...me_fps_issues/
https://www.reddit.com/r/ffxiv/comme...s_my_pc_or_the
There are plenty of approaches in those threads but neither one of them worked for me.
I removed windows game mode entirely, (what solved it for many) and this still happens. Powersaving functions, process priorities, properties of ff14 exe with disabled fullscreen optimization, driver settings, no driver settings, run as admin..and a few mode..idk...
Something doesn't work out at all since the windows update, I really don't like microsoft for pulling out such nonsense updates again, but I guess SE devs have to adjust and fix or give advises how to prevent it if its possible, they cant demand their whole playerbase to not update their pc...There can ofc be many different reasons in the end, but this feels more like there is one thing fundamentally wrong or not so many people would have this problem