I find technical books too general a category and there is no single method that will work well with all types of books. A lot is also dependent on the interest and appropriate domain knowledge (beyond basic English) that the reader should already possess in order to cover the material efficiently, within a reasonable amount of time. It is important to place the correct expectations, i.e. no normal person should expect to speed read a dictionary from cover to cover and understand much, as there is simply too much depth/content to be digested within a short time as compared to regular text like news or fiction.

Reference books - mostly used for reference, if you really intend to read one from cover to cover, be prepared to possess the background knowledge needed for an acceptable read rate. I find the TAOCP series of books to have a particularly high requirement, and speed reading is not going to work when you need to pause and think after every a few sentences. They are more like textbooks that are best studied when there are exercises to work on.

Tutorials/guides - these are the easiest to read in entirety, especially those with worked examples that can be translated into hands-on activity, which is a more engaging and effective way of verifying the knowledge gained. I do not mind prose, for which speed reading is very effective.

All that being said, it might be more important to identify the right kind of books one should read at any one time, and leave the insurmountable hurdles till later when one is in a better position to handle them.