How to stop wild FPS swings between 50-80 in Final Fantasy XV combat?

Performing magic combos was a nightmare as the frame rate fluctuated violently between 50 and 80 FPS. I tried disabling all Windows background services, but while CPU usage dropped 3%, the swings persisted. I then used the GamePP Resource Scheduler to set the priority to High and bound physics threads to high-performance cores. Frame times converged to 14-19ms per GamePP, CPU temps hit 64-70℃ per HWMonitor, and VRM temps stayed 60-65℃ per AIDA64.