Textures not loading?

[jacobi xd]

So, i play on a Macbook that i got for school (i know its terrible). Its brand new and it was very expensive ($3000+). I was hoping it would be able to run rust just fine, and i can get 40 fps at low settings. Sometimes i want some more beauty in Rust though, and my textures do not load. I see Youtubers videos and they are large green grass fields and beautiful water. My textures for grass, dirt and sand do not load. Instead of getting detailed grass or dirt, I get a faded green or brown color, like its trying to load in, but it never does. If there's any fix to tthis other than upgrading my graphics card, let me know! Thanks<3