One thing that I noticed when I was a child was that I didn't internally sound words out when I read them. I have to consciously switch to "hearing" the words in my head when I read. My elementary school cohort all told me that they always heard the words when they read and I have found this to largely be the case when I talk about it with adults now.

I think this allowed me to read faster at an early age as I was not limited to the tempo of speech when reading. Certainly this is true for many people.

One drawback I have noticed: I don't get puns when I am reading unless I slow down and voice out the words.