Why does Expeditions: Rome stutter during large battles?

While commanding Roman legions through complex terrain, I experienced strange micro-stutters that disrupted the flow of battle. I tried enabling High Performance mode in Windows, but it failed to stop the stuttering and caused CPU temperatures to spike to 82-88℃ per AIDA64. I then used the GamePP Resource Scheduler to set the game process to real-time priority and locked the core affinity. Frame time stabilized at 8-11ms per FrameView, with CPU temperatures maintaining 68-74℃ per HWInfo and fan speeds at 1200-1400 RPM per HWInfo.