In this presentation, Lead Technical Animator Chris Evans of Cubic Motion shows you how to get the best performance out of your MetaHumans in Unreal Engine, depending on your hardware. He takes you through all the scalability settings, including how to use the included LODs together with the LODSync component, how to switch from strand-based hair to hair cards, how to disable ray tracing, and more.
https://dev.epicgames.com/community/learning/tutorials/K8Ok/unreal-engine-metahuman-performance-and-scalability-settings