I was sliding it back and forth as fast as I could, because I didn't understand the puzzle at first, but then I saw there's an sorting optimization puzzle and thought that I was clever only to find out it's tedium.

Halfway through (or so I thought at move 80), I was just curious to see how ridiculously long the puzzle could be, shifting pieces back and forth

So the answer was: I thought the puzzle was easy, and I was humbled, and stubborn.

I solved it and wasted time, and used that time to warn others to not bother with the puzzle