Yeah. Reading rate varies greatly based on the complexity of the material and how familiar one is with it. It's not just the raw information density, but how much information must be retained and what that entails.

Professionals in a field very often communicate much faster with each other because so much stuff is a standard state plus deviations from that, whereas the person who doesn't know the field can't compress it like that. It's been studied with chess--good chess players are better at memorizing *sensible* board positions, but lose most of that advantage when confronted with nonsense.