Is it stuttering in the sense like you’re playing a slideshow?

If you’re on PC, or have access to a PC, pull up CMD or command prompt.

Run these two diagnostic tests.

ping -t 204.2.229.10

Press ctrl c
To end the test.

Then run
tracert 204.2.229.10

If you see any numbers saying 100ms or above or especially a * (an asterisk) then you know you’re having what is called high ping and/or packet loss. This is an ongoing issue with the internet provider NTT.net that is local to California which is where the FFXIV servers are located.

The servers were faced with this issue quite often the last few days.