Like the others said, it’s really all about taking it at your own pace. If I’m studying a subject that’s ‘easier’ for me I can get through content fast, but sometimes I still find myself getting stuck on a paragraph or page for hours at a time, even if I find it ‘easy.’ It’s not a big deal, people just comprehend some topics in a different way than others. So, I’d say you’re doing completely fine right now haha- as long as you’re able to understand the material, it’s really not that big a deal.