Network dormancy can be one of the most impactful server optimizations a multiplayer project can make. This tutorial goes over what net dormancy is and how to effectively utilize it.
https://dev.epicgames.com/community/learning/tutorials/K8vY/unreal-engine-optimizing-server-performance-with-net-dormancy
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Hilarious that such an important piece of information has 8 upvotes. Thank you for making this 
Great post!
Loved the in depth caveats.