Does speed reading work, or is it a scam?

Speed reading as it's marketed, 1,000+ words per minute with full comprehension, is not supported by the research. The ceiling for real understanding is roughly 600 words per minute. Faster than that, you're skimming, and skimming trades retention for speed. Speed reading is not reading faster. It is reading with less retention and calling it an upgrade.

Why do I feel like I understood a page when I skimmed it, then remember nothing?

That feeling has a name: the illusion of familiarity. A 2014 study by Schotter, Tran and Rayner found that readers who saw a text once often failed to catch swapped words, like "cat" replaced with "dog." The gist felt right, so the brain never flagged the missing details.

Skimming produces the same effect on a bigger scale. The shape of the argument registers, the specifics never get encoded, and your brain fills the gaps with total confidence. You feel like you understood because the topic is familiar. Familiarity is not comprehension, and it evaporates the moment someone asks you to explain the point.

What does the science say about how fast you can actually read?

The most thorough review comes from Rayner and colleagues, 2016. They examined every major commercial speed reading program, and the conclusion is blunt: there is no evidence that trained readers can exceed about 600 words per minute while maintaining high comprehension.

The review was published in Psychological Science in the Public Interest. The bottleneck is visual. Your eyes can only take in a few words per fixation, and that limit is not something an app can train away. "Rapid serial visual presentation," the technique that flashes one word at a time in the center of the screen, can push your raw word count much higher, but comprehension drops with it. You get triage speed, not reading speed.

What actually works when you only have 20 minutes?

The honest answer is the opposite of what the apps sell: slow down and retrieve. Ebbinghaus mapped the forgetting curve in 1885, and it still holds: memory decays fastest in the first hour after learning. Killingsworth and Gilbert, 2010, found that people's minds wander about 47% of waking hours.

Put those together, and speed reading while half-distracted is just faster forgetting. What sticks: read one section, close the page, and recall the point in your own words. Retrieval beats rereading, every time. Use skimming for what it is actually for, triage: decide whether a document deserves a full read, then read the parts that matter at comprehension speed. If you want to train the retention side instead of the word-count side, see Absorb on the App Store, a daily brain training app built around the skills that actually move the needle: attention, comprehension, and recall, not words-per-minute theater.