Why is The Sims 5 stuttering during large population calculations?

Building a massive community was frustrating; every time a new resident was added, a 0.3s micro-pause occurred, making the system feel strained. I first tried enabling Windows Game Mode; while responsiveness felt slightly better, the frame drop frequency didn't change, leaving me anxious. I then used GamePP Resource Scheduler to set the main process priority to Realtime and bound threads to physical cores. Core load stabilized at 65-72% and CPU temps stayed at 62-74℃ as confirmed by GamePP Hardware Sensor.