Why the images? I can go in the game and test it, which is what I did way before the write-up (Hivebusters). You can absolutely tell the difference on a 4K display immediately for the performance option, but less so for quality where it's more splitting hairs (but still distinguishable). And seeing the actual frametime numbers now I don't think there's any reason to go for the Perf option ever instead of Quality. I guess we'd need to see it on a weaker GPU like a 2060 and see if the math changes. I do recommend it though, I 1000 times prefer turning on VRS than turn on dynamic res which looks like dog vomit thanks to UE4's crap TAAU. Yuck!