Why does Neverness to Everness stutter during fast city driving?

While performing high-speed drifts, I noticed a brief freezing sensation; these micro-stutters are fatal in open-world games. I tried enabling Game Mode in Windows settings, but while FPS increased by 2, the frequency of drops actually increased, leaving me confused. I used the GamePP Resource Scheduler to force the main process to Realtime priority and locked core allocation. RTSS frame time curves converged from 15-38ms to 10-14ms, and CPU temperature remained at 64-70℃ per HWiNFO, while AIDA64 showed CPU load at 40-65%.