Every Neal Stephenson book I've read, I've gone through at break-neck pace wanting to know what happens, and later reread substantially more slowly to get make sure I follow as many of the ideas as possible.
I do it with academic papers,too - but because my goal is to index it and to identify quickly if I need to read it more carefully now, or just to know enough about it that I can remember it exists if I need it later. Of course, I don't pretend it's even speed reading - I literally skip most of the interior text.
I'm not concerned with spoiling the plot, but rather giving myself a structure to be built out with details. [There's a term for this in learning theory that was mentioned in Pragmatic Thinking and Learning, but ironically it's slipping my mind right now.]
Related - Here's an example of how I took notes on the book REMOTE. https://github.com/tedmiston/notes/blob/master/books/Remote....