I don't think I subvocalise, I read way faster than I can speak. There's certainly ideas flowing through my mind as I read, but not sounds. It feels like a mixture between words, thoughts and emotions, not a stream of (silently) spoken words.

I bought a book on speed reading because I was dissatisfied with my "slow" reading, only to discover that according to their tests I was way up there in both speed and comprehension :-D

I was shocked to learn from that book that many people subvocalise - it felt so foreign (and utterly cumbersome) to me. I hadn't even considered people did that.

Most of the book was about not subvocalising - which I don't think I do anyway, so I never read it to the end.

Indeed if I read to my kids I'm often simultaneously reading one sentence aloud, and reading 1...2 sentences ahead for myself so I get the voices right. So in effect I'm reading the entire text twice while speaking it once.