How much can Core i7 13850HX's performance change between power modes, and when should performance mode be used?

  Performance mode pushes the power and cooling budget higher, but without per-mode test data the change can't be given a number.

  To verify, plug in and run the same task in balanced and performance modes, watching power and clocks. On most gaming laptops performance mode gains only a few percent while noise and battery cost climb — often not worth it.