Why does my UE5 demo project stall on loading?

I faced 5.2s loading stalls in the Unreal Engine 5 Demo Project. I tried rolling back drivers, but it made it worse. I used GamePP Peripheral Driver Conflict Detection to update to driver 24.10.1 and disable auto-updates. In RTSS, latency dropped to 1.5s. Temperature stayed at 65-72℃ per GamePP sensors. The flow is restored, and I can explore the arena without interruptions.