spreeder.com - online speed reading application: "...the idea behind speed reading is that we can process information much faster than we actually do in real life with a book in our hands. Several factors affect our reading speed, like subvocalization (the little voice inside our heads that reads along with us and slows us down), backtracing (rereading parts over and over again), etc.
The purpose behind apps like these is to train our minds to get rid of all the other crap. So, by having a steady input of text, we erase our dependency on backtracing. By increasing the reading speed, subvocalization can't keep up and eventually goes away. The key here is that we don't need to subvocalize to process information, as much as we may think we do."