How to fix wild FPS fluctuations in Dying Light 2 on Intel i5-12400F?

Entering the city center for the first time was a disaster; the game turned into a slideshow with FPS jumping between 35-55 per RTSS. I tried manually ending non-essential processes in Task Manager, but they just reloaded after restarting, which was exhausting. I used the GamePP Resource Scheduler to set the game process to Realtime priority and pushed background items to Low. Now, CPU temperature is 68-75℃ per AIDA64, and VRM temperature is 55-62℃ per HWiNFO, ensuring smooth frames.