Greetings fellow Eorzean,

Are you running multiple monitors by any chance? Do you have any other applications running in the background? I would advise trying a clean boot of your PC to minimize any sort of interference from other applications. This can be done by opening the task manager and selecting the “Start up” tab. Disable everything listed under this tab and then restart the PC, and proceed to launch the game and test if the issue persists in an instanced area.

I would also recommend adjusting your in-game settings to see if it may help with the issue. Within the graphical settings of the game, there is an FPS limiter option; you can try adjusting this accordingly and seeing if setting a cap on your FPS helps with the jitter. Additionally, have you tried switching between windowed, borderless windowed, and full screen?

We hope we can be of assistance with this issue!