I once saw a high resolution CPU graph of a video playing in Safari. It was completely dead except for a blip every 1/30th of a second.

Incredible discipline. The Chrome graph in comparison was a mess.

Safari team explicitly targets perf as a target. I just wish they weren't so bad about extensions and adblock and I'd use it as my daily driver. But those paper cuts make me go back to chromium browsers all the time.

I find Orion has similar power efficiency but avoids those papercuts: https://kagi.com/orion/