How to stop 2-second freezes in Space Marine 2 with 8GB RAM?

I remember facing the tide of Tyranids when the screen suddenly froze for two seconds; this classic memory overflow causing virtual memory swapping made me eager to try extreme optimization. I first tried lowering all graphics settings to minimum; while VRAM pressure decreased, memory usage remained critically high, which was counterproductive. I used the GamePP Resource Scheduler to limit background memory and fixed the page file to 16GB on the SSD. Frame time converged to 10-18ms per RTSS, with memory temps at 42-48℃ per AIDA64 and disk I/O at 20-35MB/s per CrystalDiskMark.