That video is excellent and really shows how people need to be shown a difference that is so tiny that without being pointed out it is not that noticeable.
I have looked at my phone and as some have pointed out "switched to low power mode" and find that the best way I can describe it is that if I had two exact same cars, one could get from 0 to 60 in 6 seconds the other gets there in 7 seconds, sure, side by side, one could tell, but, in real life, although there is a difference, it's not that big.