> just to see some dumb frames on a screen that are discarded at a hundred per second. If these frames were really discarded (that is, not shown on your screen

> just to see some dumb frames on a screen that are discarded at a hundred per second. If these frames were really discarded (that is, not shown on your screen), then yes, it would be a waste. But my understanding of your example is that these frames were displayed, and their light reached your eyeballs.