Your eyes will follow the tip of your pointer, smoothing the flow of speed reading. The speed at which you read using this method will largely depend on the speed at which you move the pointer; so if you want to speed up your reading, you also have to increase your pointing rate.
Research shows that there is a big relationship between reading rate and reading comprehension.
Some people read rapidly and comprehend well; others read slowly and comprehend badly. Thus, there is some reason to believe that the factors producing slow reading are also involved in lowered comprehension.
Good comprehension depends on whether you can extract and retain the important ideas that you’ve read, not on how fast you read them. If you can do this fast, then your reading speed can be increased.