When I'm focused, I notice that reading silently helps increase my reading speed and cognition, like everything is flowing in.
Other times I don't seem to understand anything if I'm not reading it aloud in my mind.
Has anyone noticed such a thing and if so can you share any tips or information you've learned about this behavior
One of the things about speed reading they said was sub vocalisation slows you down - and they had some exercises if this was an issue iirc. A google turned up some speed reading classes on line so they may help, and there's a lot of books. I can't recall which one it was I read unfortunately.
Speed reading https://en.wikipedia.org/wiki/Speed_reading
I also do visualiazation, which is somewhere in between (like your flowing statement). In this, I view it like a movie in my head - the scene is visualized without subvocalization and the statements by the characters are subvocalized. This mostly works for novels, but can be used for nonfiction that describes how to perform some action or series of actions.