Yes X 1000! Once I started doing this I started to finish courses, and lectures. Before, I was nodding out within a half hour. I'm not a smart guy either. Just an average, or low average IQ(too lazy to take the test actually). I watch the videos at 1.4x or higher, and slow down the speed when something complex is introduced. (Teacher must have good diction, and an accent I'm familiar with--no mumblers)