Rereading the same page three times isn’t failing. It’s the page doing its job.
STILLNESS
STILLNESS
Slowing down on a hard page is the page working. Dense writing resists you on purpose, and the loop back to the top is the point where the idea is actually being handled rather than skimmed past. Speed is a poor measure of reading, and a worse measure of understanding.
Next time you catch yourself on the third pass, drop the verdict about your focus. Read the paragraph out loud once, then write the idea in your own words in a single sentence. If you can do that, you have it, however long it took.
Which book has made you stop and reread a line?
Free, with nothing to buy inside it.