How do I stop frame rate jitter in Resident Evil 9 with an Intel 660P 512GB?

Scene transitions in the ruins caused painful stuttering. I tried manual overclocking, but it caused a blue screen restart. I used GamePP Power Plan Switcher to switch to High Performance mode and locked the minimum core count. Cinebench single-core test confirmed frequency stabilized at 5.2-5.4GHz. In-Game Monitor showed FPS jumping from 75 to 95. The immersion is finally back.