DS9 does not like to read either, but he is the kid who scores 143 on the PRI and 2 STD lower on VCI. He had vision issues, and had gone through vision therapy, which helped but not as much as I would hope for. He just picked up Harry Potter 2 weeks ago and likes it. Unlike his older brother who could finish reading the entire book in one day. He is much much slower, as expected

DS9 reading comprehension just picked up recently, which I am not entirely sure if it is due to vision therapy.

Like others who have commented, I would not rule out vision issue. Does he easily get tired after reading a few pages? Does he skip lines and forget his space while reading? How is his posture and handwriting?