I'm somewhat astonished by your RAM problems. I mean: I have a scene with 13 Victoria4's, each with its own diffuse+bmp bitmaps for each part of the body (head, torso + limbs) the rest of the bitmaps being often shared.
Poser13's RAM needs climbed up to 5Gb of RAM, nothing more. I think that it jumped up to 18Gb at render time.
MY PC is a 4 years old one (in July), equipped with 32Gb, and Windows running on a fast SSD.

But when I remark that Poser (whatever the version) starts to act as if it's on quicksand, it's a sign for me that I have to reboot the PC (not turn off and on again: restart)

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sonoma 14.6.1, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️