Reading is the simultaneous work of the brain, eye and memory. This process involves several mechanisms at once, on which it depends on how quickly we perceive and learn what we read.
Reading speed is associated not only with physiology, but also with human experience. One of the factors here is a passive experience. People who have been surrounded by literature from childhood have a huge passive vocabulary. Therefore, even rare and complex words, they will recognize immediately. For those who are faced with a written speech infrequently, reading is slower, since they have to remember the meaning of certain words or guess this from the context.
The second factor is language knowledge. Even if you know a foreign one well, reading on it will happen slower.

It is impossible not to take into account the type of person’s personality. One can interact with the world through the details, and the other through common meanings. Therefore, both can read at different speeds.
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