How technical is technical. That's in the eye of the beholder. And depends on the purpose I expect it to serve.
Technical books I always do multiple passes. If I try to do it in only one pass I have to slow down too much. It's faster superreading it more than once than to skitter or rhythmically peruse in just one rapid reading I'd only be reading books a bit faster not really making the best use of my reading time and ability to get better information from another book.
Alex