Tangential to performance, but last I used it (2018ish) Safari had by far the best power efficiency, which is important when running on battery power (iOS and MacBooks are Apple's most popular devices). It was like a 2-3X difference, doubling the battery life. I thought that was really interesting, how much they optimized for that, and how Chrome seemingly did not at all.
From what I understand (speaking casually to someone on the Google Chrome team) Safari is able to integrate into operating system level APIs that are not available for other applications, impacting especially power efficiency.
Since Chrome on iOS is mostly safari (as far as the heavy lifting goes), I expect Chrome on iOS is easier on battery than it is on Android.
My meaning was that Safari is heavily optimized for power usage because most people using it are on mobile devices, and the difference is dramatic, at least on macOS where you can compare it.
I wonder how Chrome's traffic compares across mobile, laptop and desktop (I don't think laptops can be detected in browser stats). They certainly seem to focus on maximum performance above all else.
