what does the setting "timemarks" do?

ive come across i think a new setting called timemarks, i fiddled with it and it didnt seem to change anything.

also how do i increase the render distance of textures/meshes? whenever im playing on east coast or automation test track i just see the trees pop in whenever i get closer to them, anyway to atleast reduce that effect?

 

It basically changes the amount of tire marks that can stay visible at the same time

As for the popping in models, I don't think you can change that (unless I missed a setting)