How to fix FPS jumps in Frostpunk 2 during city expansion?

While managing a massive industrial zone, I noticed the frame rate jumping randomly between 40 and 60, which was particularly distracting in the frozen landscapes. I first tried updating to the latest BIOS to optimize scheduling; temperature dropped by 1℃ per AIDA64, but the fluctuation remained per RTSS. I used the GamePP Resource Scheduling Panel to force the game to Realtime priority and disabled all non-essential background services. RTSS showed frame times converged from 15-35ms to 10-18ms, with CPU temperature stable at 72-78℃ per AIDA64.