It's just skimming. If you were reading a book, you would just scan across it to find what you want. You don't have to read everything on the page to know what it is talking about.
I would not say that. When you are skimming, you actually skip parts of the text. Since an audible text is a constant stream of data, just skipping parts would make it incomprehensible
In speed reading, you can read sentences backwards and the brain will reorder them in real time. You can learn to decouple image (symbol/word) acquisition from comprehension. Step one om this path is to stop subvocalization, saying words out loud in your head.
It's the same difference between Sync (O_DIRECT) and Async disk writes.