I read a lot. (I wish I could give you some actionable advice here, but there's nothing I can point to. I suspect it may be innate?)

I think I'm semi-skimming, subconsciously. I've noticed myself missing descriptions of characters before when something relevant comes up later on. That said, I'm still quite fast with reading things like internet essays, where missing words does hurt your comprehension badly, so I don't think that's all of it.