Why does Hitman 3 drop to 30 FPS in crowded maps?

When the map fills with hundreds of NPCs, the CPU is basically frying eggs, and my frame rate plummets from 80 to 30. I first tried limiting the maximum processor state to 90% in Windows; while temps dropped, the game ran like a slideshow. I then accessed the GamePP Fan Curve Configuration panel and maxed out the fan speed to 2100 RPM for anything over 80℃. AIDA64 stress tests showed temperatures suppressed to 84-89℃, and GamePP confirmed fan speeds stable at 1800-2100RPM. No more throttling pain!