From a BBC report:
Speed reader and Potter fan Anne Jones was one of the first to finish the book, reading more than 4,000 words a minute.
“It’s a real page-turner, great fun. The kids are going to love it but there are some sad moments in it,” said the 55-year-old.
That’s about the level of reading comprehension you can expect to get, reading 4,000 words a minute.