Specifically, when I create keyframes using Pose Library for like 5 - 10 minutes (not sure if this is relevant). I found a weird work around where I change the Undo Depth in Preferences to a certain value (I cycle around 50 - 53). Not sure why that works, but everytime I change it, C4D memory usage resets as if the memory was purged.
Is there like a better fix for this one?