Thank you for the update ArykStrya. I apologize for the delay in our response.

Can you think of any similarities between the two PCs? Whether it be the same hardware or a program that's usually running while playing both?

Is any part of your PC overclocked?

You may want to try a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. This will make sure that no background processes are interfering with the game.

Try closing other programs that may be open while playing the game (including any overlays such as Geforce Experience, Discord Overlay, etc.).

If those do not work, reinstall the game. When you do this, make sure to delete the locally saved files (located My Documents > My Games > Final Fantasy XIV).

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!