The current average reading speed is in the order of 150 to 200 words per minute. However, the United Nations have defined that the current minimum for what is called functional literacy is 400 words per minute ...

Speed Reading is all about minimizing interference that prevents us from reading at our brain's normal speed, which is more around 600 to 900 words per minute.

It is not a question neither of zigzagging on the page, nor of "scanning" the page, but indeed of a complete reading, which is the only option to allow to have not only the speed, but also the comprehension and the integration of content.