It really depends on how you process information and what type of book it is.

I'm a tactile learner, which means I learn best with hands on activities. I when I was in school I needed to be taking notes to remember anything from lectures, I never needed to look at my notes again, but doing something with my hands made it easier for me to remember what I was hearing. If I just sit and listen to a book, my mind drifts off within minutes.

I primarily listen to things like cozy mysteries or other "light" nonfiction on audiobooks. I'm also listening to them in English, the only language I speak fluently. These are not books with unfamiliar words or phrases, so I'm not trying to learn new words or figure out subtexts. I've been told I speak fast and when I taught I would have to try to slow down my normal rate of speech. I find it annoying when people talk slowly, so I love speeding up the playback on everything that I can.

I also have a lot more time than the average person, I'm retired, and where we moved puts me in the car for long periods of time, I and I walk a lot.

Try not to compare your reading to other people's. If you read a lot, you will likely increase your speed, especially if you are reading in another language. You may want to research if your dominant learning style is visual, audio, or tactile and figure out what the best format is for you.