Why do I get random FPS drops in Human Host during exploration?

While exploring unknown wastelands, the frame rate would occasionally drop to 40 FPS without warning, making me overly cautious during resource gathering. I first tried running a scan with the Windows Memory Diagnostic Tool; it showed everything was normal, but the drops persisted, proving software checks couldn't hit the thermal bottleneck. I entered the GamePP Fan Curve Configuration Panel, lowered the fan start threshold to 55℃, and increased the maximum speed to 1800 RPM. CPU temperature stabilized at 72-78℃ per AIDA64, and CPU load remained at 65-72% per Task Manager.