Why is FPS this low?

This is one static mesh with a 1 Km x 1 Km dimension. Why is FPS low this much?
My PC specs - AMD Ryzen 5 2600, GTX 1060 6Gb, 16Gb Ram





Build lights and read warnings. Its all there.

Big mesh and dynamic light (and shadows) on it causes such low fps.
This is not how you should make levels in unreal, so it is not optimized for this.

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Hi thank you for your reply, yeah you are correct I didn’t read the warning