[Phithagoras]

I'm sure you know the speed of reading depends on the 'density' of the material in the book.

If you were (or want to become) a pianist good at reading sheet music it would likely help your language reading. Instead of reading one line of text at a time your brain can read an inch or two of lines at a time. Many of my musical colleagues and I saw this anecdotally in our lives. It only works for material below a certain density though, Its not possible for me to read more than one line of a math textbook at a time, but I can do it easily with say, fantasy fiction.

If your goal is to save time in the total course of your life though this may not help you. Reading sheet music quickly takes some time to learn!