There is a FPS slider in the game video options, but PoE minimum frame rate cap is 30, not 22fps.
You can look at the register to check the game settings:
HKEY_CURRENT_USER\Software\Obsidian Entertainment\Pillars of Eternity
MaxFrameRate_h2741477806
1e = 30 fps
ffffffff = uncapped
A cap of 22 is so low that suggests something else is interfering: a battery boost, a performance monitor with "optimizing" options, a energy saving profile.
How someone else with a similar issue fixed it:
https://steamcommunity.com/app/291650/discussions/0/618457398962702695/?ctp=2