May be of interest to some, https://www.ghacks.net/2018/10/29/remove-stutter-in-windows-10-games-with-intelligent-standby-list-cleaner/
Official download and discussion https://www.wagnardsoft.com/forums/viewtopic.php?f=5&t=1256
I gave it a try (manual).
Before pic is not mine (forgot to take one), but I had 8xxx mb standby,
Mine after using the app,
This is current after switch on pc today (after some gameplay, browsing, etc...),
Have seen one post claim this is a windows bug (?) since build 1703 to current, as in not releasing the standby (could assume it should happen/clear/reduce at some level or pc start).