Aight, decided to give this a go too since i saw it. Changing to quadraphonic, and having my sound format settings at the lowest I could get 16bits, 44100hz (CD), while also having disabled the spatial audio managed to remedy stuttering almost entirely for me!

When I say almost, its really strange when it stutters. After doing many job tests including Sage since I've seen few people mentioning it before, both EW trials (normal and EX), various dungeons and raids from roulette and one hunt train. 0 stutter,
HOWEVER only when I'm inside my house trying to open retainers, or even interacting with the summoning bell, causes immense stutter. I got no idea whats going on, but yh wanted to share this