Why does FPS drop during combat in The Callisto Protocol?

In Callisto Protocol, whenever massive debris collisions occurred, my CPU hit 92℃ and my FPS halved to 30. It was a total pain. I tried enabling Power Saving mode in BIOS; while temps dropped, the game became unplayably laggy, which was disappointing. Using the GamePP Fan Curve Configuration, I implemented a gradient curve starting acceleration at 65℃ and peaking at 1800 RPM at 80℃. Cinebench stress tests showed max temps dropped to 81-84℃ per AIDA64, and HWiNFO verified a stable 4.2 GHz. Memory stayed at 48℃