How to stop FPS drops from 60 to 20 in Minecraft RTX mode?

Running Ray Tracing on 8GB RAM is a nightmare; turning the camera caused jagged tearing and FPS to tank to 20. I tried closing all background apps, but freeing 400MB didn't stop the tearing. I used the GamePP Resource Scheduler to set priority to Highest and ran the memory fragment cleanup tool. RTSS showed frame times stabilized from 18-65ms to 15-22ms, GamePP confirmed memory usage dropped to 82-88%, and HWInfo showed temps at 40-46℃.