be quiet honestly the game runs smoothly on 144fps on ultra graphics for me and instant loading times maybe you should get a better pc

No tips for the slow loading sadly, but I believe the black roads are caused by PBR textures. I can't remember which setting it is that enables them, but it's only enabled when that is set to "Ultra". There's also a process to get them working on Linux but it's a bit of a challenge.

Loading is slow regardless

You gotta Google a tutorial. I run it on a steam deck and enabling this one thing fixes textures.

u have potato pc