What framerate do you get on 1920x1080? Are you running any other mods?

Same, but with a Ryzen 5700X3D and 1080p. fps are really unstable on my calamity world, reaching 30-40 fps on worst cases. Tested on a new world with all mods off except the fps unlocker and it stills runs terribly, in this case fps are actually not that bad (90-110 fps) but 1% lows stays between 40-60 fps even when AFK so it feels very jittery. Tried messing around with Hero's mod to stress test it a little bit and... yeah, it is not good. Weird thing is GPU utilization never goes beyond 70%, not even at most intensive scenarios.