Why does Cities: Skylines II stutter with high-precision MODs?

I was building a super-city of 500,000 people and felt total frustration when severe screen tearing hit every time I zoomed in. I tried lowering texture quality in the settings, but the buildings turned into pixelated mosaics, which completely killed the immersion. To fix this, I used the GamePP Resource Scheduler to set the game process to real-time priority. Frame time stabilized at 12-16ms per RTSS, VRAM usage settled at 6.1-6.8 GB per GPU-Z, and temps stayed at 68-74℃ per AIDA64. It finally feels smooth.