I know for 100% sure that they atleast updated shaders on tracks. There were articles, officials previews from iracing of old vs new comparisons and so forth. Car graphics have been massively improved aswell, I remember playing the rtrainer about 6 months after iracing first came out and then seeing videos of it in the last year or 2, massive difference. The car graphics improvements look personally to me to go much further than just core graphics engine improvements. The cars themselves seem more detailed and sharper, higher res???? I could be wrong of course, but that's what it seems like. Anyways, i bet Fernando Alonso and others don't complain in their sims powered by 20 supercomputers that still have rf1 graphics or even worse, so who the hell are we to complain???? People honestly don't know what a simulator is, and some of you clearly don't get enough enjoyment out of the pure driving part, hence you are so concerned about visuals.