**TL;DR:** On the left hand side, click through the speeds, 1ms, 2ms, 3ms, etc. The web browser will play the animation at 1 millisecond (1ms), 2ms, 3ms, etc. You will never fully "see" it at the rates below 16.667 ms because the monitor refresh rate (60hz) will interfere with the browser refresh rate (~60 fps).

16.667 ms is the threshold of perception on the internet.