Use a stick or capped pen to follow along with the words read. This helps to maintain a consistent pace until you're trained to use your eyes instead of a physical object.
Do not go back and re-read. Studies show you will retain most of that information (even if at first you think you don't).
3 tips for speed reading:
https://www.google.com/amp/s/ideas.ted.com/a-speed-reader-shares-3-tricks-to-help-anyone-read-faster/amp/