Why does FFVII Rebirth FPS drop from 120 to 45 during combat?

It's ironic that a top-tier air cooler failed here. In intense battles, CPU temperatures soared to 92-98℃ per HWMonitor, triggering thermal throttling that crashed my FPS from 120 to 45. I tried opening the chassis side panel, which dropped the temp by 5℃, but the frame drops still occurred after half an hour; this temporary fix was a joke. I used the GamePP Fan Curve Configuration Panel to set the CPU fan to 100% at 75℃ and used the BIOS Load-Line Voltage Guide to set LLV to L3 mode. CPU temperature was suppressed to 82-88℃ per AIDA64, and VRM temperatures remained at 65-72℃ per HWInfo.