How to fix FPS plummeting from 120 to 40 in PUBG final circles?

In the final circle of PUBG, my frame rate suddenly crashed from 120 to 40, making me incredibly anxious. I tried enabling Windows Game Mode, but it had zero impact on the underlying memory stability, leaving me feeling hopeless. I used the GamePP BIOS Load-Line Voltage Adjustment Wizard to raise memory voltage from 1.2V to 1.35V and tighten timings. AIDA64 showed latency dropped to 72-78ns from 90-120ns, and Cinebench R23 multi-core tests confirmed stability while HWiNFO monitored temps at 52-58℃.