Are you crazy? It needs atleast 32 GB of RAM, 12 core and a High End GPU on PC for freaking 30 FPS.
And that's because they don't make use of next gen technologies like Sampler Feedback, Mesh Shading and SSD Streaming on PC.
Old hardware holds back new gen hardware again.
That'd because it's in editor. Builds will run fine -- game engine workflows are incredibly hardware heavy, builds are optimized (they contain compressed assets, no editor overhead, etc.) 32gb of ram is a reasonable requirement for working on a scene this complex in ue4 today.
Edit: to elaborate, try tweaking anything in the unity Heretic demo on your gaming pc -- it runs horribly in editor on my 2060 super, ryzen 7, 32gb ram, etc.
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