Possible memory leak

Advanced game (8K citizens, 2 admantine drills)
consumes ~1.4 gig ram at save load. Leaving idle to run for ~1 hr memory usage climbs to 1.8 gig. Leaving to run for day with intermittent interaction and memory usage maxes out machine’s available ram and game becomes highly unresponsive with brief moments of usability (assuming heavy swapping to disk).

Since this is on steam it is on my kids’ game machine and not my dev machine so no debug tools available, else I’d try to capture more detail for you.
Game version: 8.1.189