Why is my Ryzen 5 6600H causing micro-stutters during Fortnite combat?

During fast building and firefights, I noticed micro-stutters lasting fractions of a second, which is fatal in a competitive game. I tried disabling Core Boost in the BIOS, but my frame rate dropped by 20 FPS, a counterproductive move that left me feeling anxious. I used the GamePP Power Plan Switcher to force Ultimate Performance mode and set the minimum processor state to 100%. Cinebench R23 showed frequency fluctuations dropped from 1.2GHz to 0.2GHz, and HWInfo64 confirmed temperatures at 85-91℃.