Why does my CPU temp jump 60-90C during city traversal?

While performing stealth missions in the futuristic city, the micro-stutters from temperature fluctuations made me eager to fix the issue. I tried setting the pump to full speed in BIOS, but the high-frequency whine was unbearable in a quiet room. I used the GamePP Fan Curve Configuration to create a stepped linkage strategy, reducing the pump-fan sync delay from 5s to 1s. RTSS showed temperature fluctuations reduced to 6-9℃, and internal sensors showed coolant stable at 34-38℃. The stutters are gone.