Why does World of Warcraft stutter during 20-player raids?

During epic raids, I wondered if this mid-range CPU would suffer from scheduling delays amidst massive effects, feeling the immersion break as frames plummeted. I tried enabling Extreme Performance mode in BIOS, but while boost clocks rose, uneven core scheduling caused minimum FPS to drop from 45 to 38 per RTSS, which was disappointing. I used the GamePP Resource Scheduler to set the game process priority to High and cleared background services. Frame times converged to 14-18ms per FrameView, and CPU temperature stabilized at 62-70℃ per AIDA64 monitoring.