Doesn't modern RAM go up to hundreds of GB/s? Also, compression?
You still probably don't want to use 10% of your memory bandwidth at all times for a windowing effect?
Ergo my point about compression :-)
Desktop images are generally large blobs of pixels next to each other. I haven't verified but I would be surprised if 10x compression is not possible. So maybe 2-5GB/s? Also it's not like the GPU doesn't use up energy itself while doing this.
Dual channel DDR5 is like 60, tops, 100s is on big many-channel servers.
I don't really want 10% of my memory bandwidth being taken up by rendering my glassy title bars.
Now wobbly windows is something I can get behind.