Why does Gori: Cuddly Carnage drop from 85 to 40 FPS on an i5 12600KF?

I was so hyped for this action masterpiece, but using big moves caused my FPS to plummet from 85 to 40. I tried enabling Windows Game Mode, but it did nothing and even crashed my background apps, which was a total nightmare. I used the GamePP Resource Scheduler to set the process to Realtime priority and locked it to the physical P-cores. RTSS showed frame times converged to 11-15ms, AIDA64 confirmed CPU temps at 66-74℃, and Task Manager showed single core usage was previously 98-100%. Now it's buttery.