Why does F1 25 stutter during high-speed cornering scenes?

I felt totally robbed of immersion when my frames plummeted from 120 to 55 during high-speed corners, with AIDA64 showing CPU spikes from 62℃ to 91℃. I tried opening the chassis side panel, which lowered temps by 6℃, but the fan noise became chaotic and dust piled up fast, making it a total fail. I then used the GamePP Fan Curve Configuration Panel to trigger front intake fans to 85% at 65℃. HWiNFO confirmed VRM temperatures dropped from 98℃ to 78-84℃, and CPU-Z showed the core frequency stabilized at 4.2GHz.