I was using SkyRealism for about a month; back in June, but when monitoring my benchmarks i would have these weird dips of 2 - 10 fps. Never noticeable since it was only a frame or two, but for some reason this started to bug me (OCD). I switch over to Realvision and those dips never appeared again (Full and Performance). I fell the current option B still gives a real immersive feel. Stay way from Nova though very fantasy feeling.