How to stop CPU downclocking during street chases in Grand Theft Auto V (RP) on ASRock B450M-HDV R4.0?

My CPU downclocked mid-chase in Los Santos, causing painful stuttering. Adding more case fans only dropped temps by 2℃. I accessed the GamePP Hardware Sensor Page and adjusted VCCSA voltage from 1.25V to 1.20V in the BIOS. After a blue screen and re-tuning, Cinebench R23 showed VRM temps stable at 75-80℃, and GamePP confirmed fan speeds at 1200-1400 RPM. This resolved the bottleneck.