Why does No Rest for the Wicked stutter in dungeons on RTX 5060?

I was exploring gloomy dungeons when large particle effects triggered sudden 0.3s freezes, making combat feel clunky and frustrating. I tried lowering texture quality in the driver panel; although it freed 600MB of VRAM, the visual loss was severe and didn't solve the core issue. I then used GamePP Resource Scheduler to force the game process to Realtime priority and restricted background VRAM usage to under 5%. Frame time stabilized at 9-13ms per RTSS, and core temperature remained stable at 62-68℃ per AIDA64, with VRAM usage at 7.1-7.4GB per GamePP.