Good Morning, and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Are you receiving any graphical glitches or is it simply a lowered frame rate?

This only occurred after the Windows 10 update correct? Before that you were playing with no issues? Has anything else on your computer updated recently?

What have you done to solve the issue up until this point? Are your graphics card drivers up to date? Additionally, have you tried lowering the resolution or graphics settings (even if your GPU can obviously handle it), does this have any effect, or does the frame rate remain constant regardless of what you choose?

If none of this seems to have any affect, try turning off Direct X 11 mode and see if this adds any more stability to the game. Also, disable any programs in the background while you are playing the game (again, even if your computer should be able to handle it).

If any of these solves your issue, please let us know so we can further assist others with the similar problems. We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!