When you were seven, someone taught you to read by sounding out every letter. It worked, but the habit never left. Even now, a quiet voice in your head pronounces every word you read. Researchers call it subvocalization, and it chains your reading speed to your speaking speed: roughly two hundred and fifty words per minute, no matter how fast your mind can actually think.
Your eyes are the second brake. They do not glide across a line of text; they hop from word to word in small jumps called saccades. Between hops they pause, focus, and often drift backward to re-read a sentence you already understood. Eye-movement studies suggest that a surprising share of reading time — up to a third — is spent going backward.
Speed reading training attacks both brakes at once. Presenting words one at a time at a fixed point removes the jumps entirely. Pushing the pace slightly past your comfort zone teaches the inner voice to stay quiet. Comprehension dips at first, then recovers — and when it does, you are reading faster than you ever have, with the same understanding you always had.