That's interesting. A technology like this was predicted, on theoretical grounds from reading research, in the book
Reading in the Brain[1] by Stanislas Dehaene (which I highly recommend as a very good read).
For years 500 words per minute (approximately one printed page per minute) has been my baseline speed for most of the material I read in English. I read slower in my second languages, of course. Back in my college days, when I wanted to make sure I wasn't being slowed down in my studies by a too-slow reading speed, I read a lot of books from the university library about reading skill improvement, and several jointly suggested that improving vocabulary improves reading speed. I took a course about English vocabulary based on Latin and Greek word roots, and that did seem to help for years afterward in both reading speed and reading comprehension.
[1] http://readinginthebrain.pagesperso-orange.fr/intro.htm
AFTER EDIT, TO REPLY TO QUESTION:
In this context, "second languages" is a quite normal designation for language(s) acquired after one's native language(s) were acquired. My user profile lists most of mine. I read best in Chinese and in German, besides English.
For years 500 words per minute (approximately one printed page per minute) has been my baseline speed for most of the material I read in English. I read slower in my second languages, of course. Back in my college days, when I wanted to make sure I wasn't being slowed down in my studies by a too-slow reading speed, I read a lot of books from the university library about reading skill improvement, and several jointly suggested that improving vocabulary improves reading speed. I took a course about English vocabulary based on Latin and Greek word roots, and that did seem to help for years afterward in both reading speed and reading comprehension.
[1] http://readinginthebrain.pagesperso-orange.fr/intro.htm
AFTER EDIT, TO REPLY TO QUESTION:
In this context, "second languages" is a quite normal designation for language(s) acquired after one's native language(s) were acquired. My user profile lists most of mine. I read best in Chinese and in German, besides English.