Why does Project Rene FPS drop from 60 to 20 when loading community maps?

I've had enough—whenever I switched areas while building my dream home, the frame rate would plummet from 60 to 20. I tried increasing virtual memory to 64GB, but it couldn't fix the physical write bottleneck of the SSD. I used GamePP NVMe Queue Depth Configuration to increase the depth to 128 and optimized the Windows write cache policy. CrystalDiskMark showed 4K random reads hit 68MB/s, HWiNFO64 confirmed temps at 48-55℃, and RTSS showed stable frame times.