Different people have different minds/brains. My ex read so fast that trying speed reading techniques slowed him down. I read ridiculously slowly for someone who was in a lot of gifted classes. I tried speed reading techniques. I was able to read faster. I hated it and went back to my snails pace voluntarily. I read with good comprehension, but, yes, I "say" everything mentally.

My oldest son also reads shockingly fast. When I began watching him play videogames, he flipped through dialogue so fast I could not read it. I thought he was just skipping familiar parts. Nope. He just reads that fast. He has to slow down if he wants to include me.