No it's not. What's more important is slow reading and give time to your brain to reason about the book; the form in which is written and why that, what are the

No it's not. What's more important is slow reading and give time to your brain to reason about the book; the form in which is written and why that, what are the messages that the writer want to send with it, how I will act if I'm the protagonist and so on. For non-fiction the best thing I do is underline the parts that I find more helpful.