Even if you only want to rapid read, forgetting about mind mapping, trigger words... Keep the statement of purpose, have a purpose for reading, ask yourself why you want to read the book, then still do the photoreading part. You'll probably find that rapid reading goes faster.
Also consider doing it in layers... really superread the whole book 2 or 3 times. If only to make what you read stick in the long term memory better. If you are reading for study this is what you'll want.
The idea of photoreading is to enable you to cover more ground for study. It isn't only reading speed that you want to improve it study skills. For many courses of study most people have to reread textbooks and manual repeatedly to understand them. If you're using regular reading methods you naturally take 3 times longer than a photoreader. What most people overlook is the time spent making notes, practicing the exercises and revision also take time, when you use photoreading related skills you also spend less time on these.
Learning isn't just reading the text it's gaining an understanding of what it's about and how you can use the information. Most people cannot do that just by reading the book once and without realising it they often reread the book 2 or 3 times. Once through then while writing out their assignments they often open the book again... taking ages to find the right page again... missing out on one of the key reason for photoreading the book.
Alex