Comment by saltcured

Honestly, that's not a CPU problem.

A laptop running below 5W needs to turn down its storage, RAM, GPU, LAN, WiFi, USB controllers, etc. The OS needs to act more like a smartphone, put everything to sleep, and use consolidated polling and interrupts for async behaviors.

I think this is the real advantage Apple has with their vertical integration. They can play a lot of complementary games between hardware and OS.