Cache Full ISO in RAM Question

[LunaMoo]

Hmm do you have "texture scaling" enabled? If yes, disable it or at least drop it down to a minimum and try xBRZ if you used any other as it's fastest algorithm. That feature only works when new texture get's loaded and so most people might think it's light, however it's actually extremely heavy and what you experience is pretty standard result for people abusing it beyond their hardware limits.