My GPU - an Intel 4600 integrated GPU in a 2014 laptop - kicked up to about 95% utilization while playing with the site. I suspect I was getting fewer details than you - mine was not silky smooth but still perfectly usable, at what I'd estimate to be about 20 FPS.

That your powerful GPU was putting in some effort while my poky GPU [edit: and my 2018 low-end Android phone, admittedly at ~4FPS] are still able to render the scene at all indicates to me that they put in some impressive effort to make the graphics scale for different configurations!

This Safari tab is at 65% GPU utilization on M1 MBP. Can't quite tell what frame rate but appears visually silky smooth so guessing 60+.

Do you have a high refresh rate monitor? I only hit ~35% GPU usage with 1660ti but my browser is synced to 60 FPS.

Whoever is at fault. They are just putting the thanks out there. It is not their fault that those responsible have not equipped themselves with the proper receivers.

It's like a bad API. The docs say to send, but there's no mechanism to receive. It's not the fault of the user.