Fractured Byte’s Roman Leshchenko breaks down the most common mistakes made by developers, render and content pipeline bottlenecks, some non-obvious consequences of obvious optimization techniques as well as ways of avoiding and mitigating these issues.
https://dev.epicgames.com/community/learning/talks-and-demos/O6a/fantastic-bottlenecks-and-where-to-find-them-unreal-fest-europe-2019-unreal-engine