How do I fix texture pop-in and high memory latency in The Witcher Remake on Biostar B350ET2?

Riding near Rose Town, distant mountains looked like pixelated blocks, a 102-115ns latency disaster. I tried increasing the page file, but it dropped my FPS from 78 to 61, which was frustrating. I used the GamePP BIOS Load Line Voltage Regulator to set timings to 36-38-38-72 and raised voltage to 1.30V. Per AIDA64, latency converged to 76-82ns, and temperatures stayed at 46-52℃. The immersion is back.