"It’s worth noting that because sites with React or Angular spend more time on the CPU than others, that isn’t necessarily the same as saying React is more expensive on the CPU than Vue.js. In fact, it says very little about the performance of the core frameworks in play and much more about the approach to development these frameworks may encourage (whether intentionally or not) through documentation, ecosystem, and general coding practices."

CPU usage is vaguely interesting, although I assume the vast majority of people care more about their page load speed.

I'd also note that relying on technology detection from some third party is potentially going to be very misleading, unless that data is actually regularly updated. Sites change their technologies all the time, so even a significant percentage of the sites from the Next.js Showcase and MadeWithAngular.com aren't actually made with those technologies. Unless you take the time to either go through each site by hand, or else pull out the code from the Chrome extension for each framework to detect its presence in the way that the authors of that framework endorse, then you could easily have ~30% of the sites for each technology no longer actually using that technology.