Why does Scarlet Nexus freeze during combat with 8GB RAM?

During complex particle effects, my 8GB capacity filled instantly, causing the system to frantically swap to disk. I tried closing all background programs, which freed about 500MB, but the game still deadlocked for 1-2 seconds during combat. I used GamePP Resource Scheduler to set a fixed 16GB virtual memory page file on my NVMe SSD. Memory swap frequency dropped from 120 to 15 times/sec per GamePP, FPS rose from 45 to 60 per RTSS, and memory temps stayed 42-48℃ per HWiNFO.