My reading speed has slowed significantly in the past few years (ever since I
stopped reading paperback books for the most part). The sub vocalization
issue had never even occurred to me before.
I tried reading the article by just looking at the words, and realized I could
indeed go much faster without pronouncing them in my head. I guess that's how skimming
works, but the trick is to slow down just enough to actually understand each word
while taking the group of words together as one thought.