How to fix unstable frame rates in PUBG final circle fights?

In the final circle, my frame rate fluctuates like an EKG, creating a fragmented experience that is simply a disaster. I tried increasing memory voltage to 1.38V in BIOS, but the system blue-screened after ten minutes, making me laugh at my own failure. I used the GamePP BIOS Load-Line Voltage Wizard to set LL to L2 mode and tuned VDD to 1.32V. AIDA64 confirmed memory latency converged to 65-71ns from 82-108ns, and HWInfo64 showed memory temperatures stable at 45-52℃.