Have you ever read a book but forgotten what you were reading by the end of it? Or gone to the library, picked up a book, and then wondered whether or not you’d already read it? If so, then you’re likely suffering from low reading retention.
Reading retention is your ability to hold on to the information picked up while reading a book. As you can imagine, the quicker you read something, the less you retain. The same is true for people with impaired memory or those who read well above their comprehension level.