try some of these tweaks on the mean time. just note the game engine is a hot mess, & the game as a whole is poorly optimized, so keep your expectations low. the improvements from these few tweaks may or may not yield some satisfactory result.
Not much I can do without knowing your computers part list (specs) but I can say that lowering view distance and objects detail will give you the BIGGEST boost in performance. I usually run Object Detail on Medium-High and View Distance @ around 2000.
try some of these tweaks on the mean time. just note the game engine is a hot mess, & the game as a whole is poorly optimized, so keep your expectations low. the improvements from these few tweaks may or may not yield some satisfactory result.