Can people really read this fast?

The other day I went to McDonald's, a place I associate with predictability and consistency and tasty food (not necessarily healthy, I know.... but tasty). I was with a woman who spoke very little English and so I wanted to help her walk through the list of offerings. To my consternation, I couldn't find such a list. There were specials and all day breakfast lists and other stuff. It took me a couple of minutes to see that the list of specials appeared in the left most panel and then disappeared, to be replaced by other things. It didn't stay displayed long enough for me to walk through it with my friend. It really didn't stay displayed long enough for me to peruse it and think about what I wanted, if I hadn't already known my own order.

I've seen other examples of where written things just disappear too fast for me to read them. One of the earliest and most egregious examples is the credits after a movie.

Have people really learned to read this fast? Or are these kinds of messages just not considered important enough to be actually read and thought about?

TIA
LAS