Speed reader usually sacrifices some details during reading, skipping conjunction is one of the example. So yes you need try to learn fast reading.
If I find that I’m already convinced of the point that a particular subchapter / section is trying to make, I’ll speed through it. As a result, I speed read through about 80% of most non-fiction books.
My experience with speed reading is that it’s more akin to speed “skimming”. I see all the words, I understand the point each paragraph is making, but I’m not resting and respecting every word, or really paying too much attention to sentence structure. You can miss details, but this is predicated on the assumption that those details don’t matter.
If I’m reading something where every detail does matter, or fiction that’s heavy on prose, I slow down significantly, since my objective is often to enjoy the book for the maximum amount of time possible, and not to learn as many things in as short a time as possible.
When I get to the parts I need, usually I skim it once and reread it slowly again after.
If I read a book, i will remember at the first reading nearly all the points, the structure, what it tries to talk about, what i like and why. I will not remember all the details of every single arguments or all the details of all the plot points. It is a different way to read and goal.