FF16 performance.

No idea if this would be a good place to ask, but I assume so. Sadly I am already 20 hours into the game but most of my game has run pretty bad, though it wasn't that terrible when I got used to it lol. Just wondering if theres a way to fix this:
My problem seems to be theres 0 way to actually optimise the game because even if i set everything on low graphics my gpu usage stays at around 99% and I get the exact same kinda fps range, I'm leaning to the current nvidia driver being the issue but idk