Some performance questions about polycount

Thanks for your answer. Yeah, sure. Well iam working on funfair stuff and for that i need many many small lamp meshes like arround 30-40k. Each one should have 8-20 triangles. I also working with lods for that. Thats the reason why iam think about performance.

  1. Unreal will only draw things that are visible.

Iam not sure, if i understand it right. So the triangle count will show me all faces or all without backfaces?