5800x with 3080, it's okay I just increased my graphics settings considerably.
Graphics Quality 5, Max draw distance, Increased most mesh quality settings to at least 50%, turned DLSS off. Uncapped FPS at 1440p and its gone back to around 140 FPS.
Think with settings down my GPU sits there doing f**k all while my CPU does some work? Rust being Rust!
If you lower them again, does your framerate go down again?