Perhaps it would be a good idea to similarly visualize tabs with high CPU/GPU consumption?
A browser does most (if not all) of what an OS does, so it shouldn’t be surprising if a task manager (which shows CPU usage) is also useful for browsers.
I'm not an expert in any of this. I'm not even remotely sure what I'm proposing is possible or would be effective. I just want to start a conversation because I know what I don't want and throwing ideas out into the wild is better than staying quiet. I know I have no interest in giving up any privacy for a potential few seconds saved on load time for a site I'm not sure I even want to visit in the first place. Load times should be the burden of the site owner. Ideally that would be optimized by serving only what is absolutely necessary to get me to the thing I wanted to see. Not that plus the 10 other things you and/or third-parties decided they deserve to serve and hope my machine has pro-actively pre-fetched so I don't perceive the shit-show going on behind the scenes. Given all the details of how this stuff works, I don't think most users would volunteer for it either.