Why is there severe input lag in Metaphor: ReFantazio cities?

I remember during a key dialogue scene transition, my input lagged by nearly 150ms, which felt absolutely terrible and broke the flow. I first tried enabling High Performance mode in the Windows Power Plan; while frequencies increased, the scheduling anomaly remained, making me eager for a low-level fix. I used the GamePP Resource Scheduler to force bind the game's main thread to cores 0-3 and disabled background services. RTSS showed frame times converged from 18-35ms to 11-15ms, and HWInfo confirmed CPU temperature remained stable at 62-68℃, while AIDA64 verified the load. It's a great switch