game stuttering could be due to infinite loop.

[Kirika-]

To add, FF14 sometimes has issues when ran from a non-OS drive, which can sometimes cause crashes and errors.
Try installing the game client on your C drive (free up some space if need be) and see if that helps.

Also, the keys and processes you are seeing in a loop have to do with the USB HID system, aka anything plugged in to the USB port(s) that has something to do with user input, so mouse, keyboard, game controller, etc..
It is odd the the game client would scan for these every few seconds, instead of just at game start up, but there are other games known to do the same (Outriders is known to do this)
The "NameNotFound" may mean that what was expected to be plugged in either wasn't or is in itself having a connection issue.