I sometimes speed read, although it depends upon what I’m reading. The larynx moving, lips moving, reading aloud… all slow the reading process. I will sometimes read a particularly difficult or complex text aloud to help clarify it in my mind, but that is very rare. The best approach, in my opinion, is to read most passages at a steady pace, slowing down as the text becomes more difficult, speeding up as the difficulty decreases, and reading aloud only when presented with some text that is truly difficult for you to comprehend any other way.