Why does Dota 2 experience frame drops during team fights?

I was devastated when micro-tearing ruined my mid-lane team fights during high-stakes matches. I tried lowering the memory frequency to 5600MHz in the BIOS to gain stability, but it was a disaster; minimum FPS plummeted from 85 to 72 per RTSS. I then used the GamePP Resource Scheduler to elevate the game process to Real-time priority and suppressed background browsers. Finally, frame time converged from 12-24ms to 6-9ms per RTSS, and memory stayed at 54-59℃ per HWInfo64.