TIKITU DE JAGER, a coder living in Greece, wanted to learn to program in iOS. So, like a lot of us do when we want to pick up a new skill, he started watching lessons online. At the outset everything was new, so he’d watch carefully and take notes. But as De Jager’s knowledge grew, he wanted to zip past familiar material. That’s when he started speeding up the videos. ¶ Now De Jager races along at 2X speed, slowing down only when he hits challenging stuff. “You go, ‘OK, OK, OK, I get the point’—until something new comes along,” he says. ¶ Power consumers of podcasts already know that 1.5X speed is their friend. About half the people who use podcast app Overcast listen on Smart Speed, which gooses…