Speed reading also means "speed understanding". Glancing over words is not speed reading.

Speed reading means you could factually proof you could read extremely fast and retain most of the facts of the text.

From my experience, there is people out there that could do that (after extensive training). The main problem is that you need a standardized way of displaying the text so the mind could understand it super fast.

I have met speed readers personally in Spain, France and Germany.

For example HN does not let you speed read because of the format with long lines.

On a practical way way most text is not formatted for speed reading, it should be preprocessed first, which is illegal because of copyright in most countries.