Textbooks with the "hard to read" style. No I wouldn't just go into rapid reading. When they are hard to read it means the stuff is new and if you want to understand, remember what you read it's better to give it more layers. So I would at least give it a couple of 10 to 20 minute activation layers before I rapid read. It is one text a rapid read serves to discover if you missed anything and check your understanding of what you activated previously.

Also if you're finding textbook difficult to activate, PhotoRead them again. Usually you can PhotoRead a textbook daily for 2 to 4 weeks and notice a difference in the activation.

Alex