Well.... u know in standby lists was adding all files u akscesed, so if u downloaded 10 3 GB movie clips packs, sharing 10 GB archive with uTorrent, and running game, they all in it, until u gonna clear it by hand or until windows decide to do it, when I can't say. I restarted PC and I have 900 megabytes free memory even before I started BnS. Even more game won't started until I cleared Standby list, and I have 64 GB ram... And as u shud know each character changing adds about 0.5 GB to Ram standby list, check yourself. What adds raids its for u to look. So probably its Microsoft problem, or maybe they just won't care, they fink preload windows used stuff makes your work better after u started next time to. And u know... not lots people plays daily with 100 GB+ files, so maybe its not so important to them.
maybe this will be interesting for some users
https://answers.microsoft.com/en-us/windows/forum/all/windows-10-not-releasing-standby-memory-when/874484bc-3c4d-4f0f-83ed-000e9dab971b