My familiarity with speed-reading is limited because I never deemed it worth, as I think reading should mostly be a slow pleasure, but Anki, like any well-designed spaced repetition routine, algorithm, or application, got me VERY far. I returned to high school as an adult and later attended university, which provided me with a variety of reference points to compare study techniques. Initially, I used conventional methods, but eventually, -- a few months in --, I discovered Anki. Not only did I start ranking among the top students, but I also completed both degrees in less time than typically required; something I never managed to do, no matter how hard I tried.

Recently, I've been experimenting with various study techniques, free from the constraints of formal education that could potentially bias the outcome, and I've observed a significant decline in my performance when I deviated from Anki or spaced repetition in general. Conversely, my performance improves when I reincorporate it. Mind you that I still have to put the required effort, carefully selecting what to memorize, and designing it well. You can't get away from that.