For kicks and giggles, I had two instances of FF14 running - my normal account and a Trial account I'd made a year or so ago. Both running at the same time, 60fps on whichever one I had pulled up at the moment. No lag, nothing. As per usual. (Previous to Endwalker, I was used to running FF14 plus another game like Bannerlord or Rimworld concurrently with zero issues and no fps drop.)

So, I go to the Rising Stones on my level 86 SGE and proceed to break the sound engine by spamming Dyskrasia. I break the sound engine by the second cast, getting stuttering and chopping.

Swap back over to my trial account. No sound issues at all.

Swap back to main account. Sound still broken to the point of BGM and ambient sound being choppy.