0.11.0b seems to have slowed down saving to a crawl. A regular save of ~128MB takes 20 minutes, but it will take hours if it's overwriting an existing file for some reason. As is, autosave is unusuable.
I only have an old (0.3era) custom images folder and no other mods. On a Ryzen 9 5900X and nvme SSD. The bottleneck exists elsewhere.
The save file itself seems heavily bloated (compresses down to 5MB).
It is possible to obtain two copies of Aire (neither with a yellow name). One from convincing Anastasia to live with you. The other from asking Duncan
Amelia when obtained uses a randomly generated full body image.