Inexplicable inefficiency

How is it that doing simple things requires so much power, these days? I was uploading a file to a new github release:

When displaying this tab, my GPU usage jumps from about 5% (on the page where I'm writing this, for example) to about 65%. It's got a little spinner and a little blue progress bar, and a blinking cursor, and that's it except for static elements. Why does it take more than half the power of a GTX 960 to display that? This makes no sense.