More or less the same issue here. Uninstalling iCue got rid of the majority of the stutters, and now it only stutters for about .5-1 second every couple of hours. I've tried everything listed in this post:

https://forum.square-enix.com/ffxiv/...51#post6542751

My current theory is that the client may not be playing very well when windows does stuff in the background such as updates. The stutters usually happen when there are windows updates (minor ones), there are event ID 131 errors (metadata staging errors that seem like Microsoft has given up on trying to address the cause of), and some stutters happen with no obvious background activity. These all may just be coincidences, but I've seen 7-8 of those ID 131 errors happen within a second at the exact timestamp of the stutter, so I strongly suspect it's not a coincidence. My hope is that this is either something a 14 patch or microsoft update will fix