How do I fix single-core bottlenecks and long load times in The Witcher 3 (Next-Gen Edition) on AMD Ryzen 5 9600X?

Crossing Novigrad, load times jumped from 5s to 12s, and frame rates dropped from 120 to 48 FPS with visible tearing. I tried Performance mode, but it worsened read/write conflicts. I used GamePP Hardware Sensor Page to monitor load, adjusted the frequency strategy, and exported cache scheduling parameters. HWiNFO showed frequency stabilizing at 5.5-5.7GHz (up from 5.2-5.4GHz). AIDA64 confirmed temperature held at 62-68℃, and Cinebench R23 single-core score remained stable at 210-215 points, exporting a perfect config.