Why does Avowed drop frames during stealth to combat switches?

While exploring ruins, every fast perspective switch caused a frame drop, which made me excited to try some extreme tuning. I tried changing the system power plan to Balanced; temperature dropped 2℃, but the minimum FPS dropped further, proving I needed better cooling. I used the GamePP Fan Curve Configuration to trigger max fan speed at 70℃ and set the pump response to maximum. RTSS showed frame times converged to 11-18ms, and AIDA64 confirmed CPU temperature stable at 76-82℃.