To speed read, it can help to have a pencil moving across the line you're reading. Your brain doesn't need to focus on each word, which is what it's doing. It can understand a few words and put them together.

e.g.

"The horse was brown and lived in the barn"

"Horse brown lived barn"

You can still basically tell the primary message of the sentence (sorry this was a horrible example).

so it can help if you put a pencil down and force yourself to keep up with it. However this may sacrifice some comprehension, so start slow? This may or may not work for you and you should probably stick with comprehending, which is okay.