Why does BioShock 4 stutter on Maxsun MS-Terminator B650M WIFI6?

I felt totally disconnected while exploring the deep sea city; the character movement was twitchy, breaking all immersion. I tried enabling Extreme Performance mode in BIOS, but VRM temperatures soared to 88-92℃ per HWMonitor, triggering thermal throttling that made the stutters worse. I then used the GamePP Resource Scheduler to set the game process to Realtime priority and lowered audio service priority. Frame generation intervals converged to 13-16ms via GamePP Analyzer, and core utilization stabilized at 70-82% per AIDA64, with temperatures at 65-72℃ per HWMonitor.