I read fast enough for my own taste (I’ve never tested it—the big hurdle is finding time to read but I don’t think I’m much above or below average) and I like that I have an internal narrator! I’ve spent a lot of time reading poetry in French, Latin, and Greek and think that good writing should be “heard,” if that makes sense. I write casually and will delete if something would be difficult or awkward to say out loud, and I have to assume at least some of the people I am reading do the same. Good prose requires a good ear.