I read slower when I read out loud. There is a good thing that comes out of reading a loud, I tend to stay with the story longer, or whatever I have to read. Silent reading, I read faster but space out more. Then there are times when I see a word and think it is that word only to discover shortly after that is not the word the author used.
My teacher taught me a method to figure out why I spaced out at that spot. Here are some questions: Am I too tired to read? Is there a reason why I spaced out? What do I get out of the space out? Take notes on time space out, thoughts that just popped into head, and some feelings about the characters. Perhaps even make a character that I can use to get me back into the story.
This works well. I find the topic changes my mood on reading. Normally, I am overwhelmed rather then tired, because I have to read the pages in a moment of time. The character works wonders too, however, my brain puts the made up character into the story and becomes one. Sometimes my feelings even have problems with reading. The whole reading a loud forces me to look at each and every word. Seeing words sometimes overwhelms me as well. Too many words not enough time. Yet, I can read up 1-3 books a week, depending on the speed it takes me to get into the story.
Happy reading 