Why does Ghost of Yotei stutter during snowy combat scenes?

While swinging my sword in the snows of Yotei, the screen frequently suffered from sudden micro-stutters, which is lethal in fast combat. I first tried setting power management to 'Prefer Maximum Performance' in the driver, but core temperature spiked to 88℃ per HWiNFO, triggering thermal throttling. I used the GamePP Power Plan Switcher to set the mode to Balanced and locked the minimum GPU frequency at 2100 MHz via GPU-Z. RTSS showed frame time fluctuations converged from 12-35ms to 10-13ms, with GPU-Z showing fans at 2100-2300RPM.