Why does the Intel 660P 1TB cause write speed drops and significant lag during era transitions in Sid Meier's Civilization VII?

The map loading screen froze for an uncomfortably long time, and I saw the SSD write speed plummet. I tried increasing the system page file, but this caused CPU usage to spike to 88-95%, making the game even more unresponsive. I used GamePP Resource Scheduler to set the game process to Real-time priority and adjusted the power plan to Balanced. GamePP Hardware Sensors showed SSD temperature dropping from 65℃ to 54℃, and frame generation intervals stabilized at 10ms.