Or underclocking...to get longer lasting battery or device. Most of time Pinephone uses only 1/20 of it's CPU.
Coolest way should be desktop widget that has 3 sliders like this:

CPU speed 125 Mhz --O-----O-------------- 1.5 Ghz
Battery life 1 min --O-----------------O-- 96 hours
Device life brake -------------O-------O- 100 years

And buttons (Use new settings) (Revert old setting)
And when you move one of sliders it moves two another automatically, by estimation calculation.
And it gives warning "Are you sure" if you try brake device.
And it automatically set between underclocking and overclocking by cpu load and how much battery is left of those lowest and highest setting.