Why does DOA 6 drop to 30 FPS in crowded city centers?

In crowded city centers, FPS plummeted from 60 to 30; GamePP showed L3 cache hit rates dropping and process scheduling jumping between cores, causing 20-55ms frame time fluctuations. I tried enabling PBO auto-overclocking in BIOS, but the resulting heat caused frequency throttling and worse frame drops, which made me furious. I used the GamePP Resource Scheduler to set the game process priority to 'Realtime' and shut down all non-essential background services. RTSS showed frame times converged to 16-22ms, and HWMonitor confirmed CPU temperatures were stable at 65-72℃.