Effective reading is a kind of efficient observation. Instead of a search area, we have a book or a text. Instead of an object, we have keywords. Reading is our main mechanism for absorbing facts and concepts so it deserves and requires a section of its own.
However, it diverges from observation, too. Efficient reading means using your thinking skills to read with purpose: for instance, are you reading for specific information or reading for wider understanding? It's about using specific strategies to get the most out of what you are reading, then structuring and reviewing what you have learned to maximise its absorption into long-term memory. Applying those skills and strategies on a regular basis will increase your reading speed.
Our favourite source for efficient reading is the excellent book Read Better, Read Faster by Manya and Eric De Leeuw, first published in 1963. But many others, particularly Tony Buzan, have written on the subject.
As with observation skills, the rule with efficient reading is the same as that for thinking and memorisation. The more you do, the better you get. There is an extra part to the curriculum here and that is to encourage your child to read faster, but not at the expense of understanding. With practice, we would hope your child could end up reading at 500+ words a minute with excellent comprehension. The key word, though, is practice.