where is memory going in In-Memory OLTP?
Memory for In-Memory OLTP is under the sp_configure setting for max memory, but is not part of the buffer pool. Not sure if that helps or not. You could have a lot of stale rows that are waiting until there is memory pressure in order to be &quot;garbage collected&quot;. I wrote a script that's part of Brent Ozar's First Responder Kit that might be of some help to you, located here:
https://github.com/BrentOzarULTD/SQL-Server-First-Responder-Kit/blob/dev/sp_BlitzInMemoryOLTP.sql