I saw this. For anyone wondering, the game has inis in the main folder that determine the graphical settings in-game. So "low" graphics settings are "low.ini", for example. This mod replaces them with tweaked settings - low goes lower, ultra goes higher.
I tried the potato (aka the replacement for low.ini) settings on Steam Deck and they greatly improve frame-rate, but at the cost of resolution. It sets the resolution scale to 35%.
Well I already can't get more than 75-85 FPS in most places even with a 4090 (edit: 4K with 75% res scale), so I was hoping that this mod* would optimize for performance at all quality levels. I don't need to go beyond Ultra. No currently-existing PC does.