Why does UE5 Matrix Demo stutter during fast camera panning?

I was running the UE5 Matrix demo and felt total despair when severe frame drops hit every time the camera swept through complex lighting. It completely broke the immersion. I first tried enabling the High Performance power plan in Windows; while frequencies rose, the load imbalance persisted, making the attempt useless. I then used the GamePP Resource Scheduler to set the engine's main process priority to Realtime, forcing task redistribution. Core temperatures stabilized from 62-78℃ to 68-72℃ per AIDA64, and frame times dropped to 12-16ms per RTSS, with power at 65-75W via HWiNFO. It's finally smooth at 72℃