It might help to learn how to read without subvocalizing the text. It sort of like coming up on a stop sign, in that you don't have to say the word "Stop" in your head to know what the sign says.
Then again one might argue that you simply know what the sign is, because of its shape and color, however that's not the point.
Well, there's no real voice acting in Zelda anyway... so you can sort of create it yourself haha.