It’s rough on CPUs and GPUs. If CPU is below a certain threshold you are never getting above 30-40 fps no matter what. There are some performance mods you might want to try out. Most of them are just ini settings but some recompress textures and stuff. In a few months it should be possible to run Starfield while not looking too ugly on a low end system with mods.
Solution: https://www.amazon.com/JSAUX-Protector-Hardness-Resistant-Tempered/dp/B0BM9BPQQ8