Symmetrical meshes - import half and mirror in engine?

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Hi - I was wondering if it is better (from the performance standpoint) to have a symmetrical mesh imported as one half, and then mirrored in the engine? Or would this actual make the performance worse, since there are now two objects to form a whole instead of one?

This one has been bugging me for quite some time, I thank you for all the answers!

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Polygons are pretty cheap until you get into the hundreds of thousands. There’s much more productive optimization to consider before having to deal with mirroring geometry, which might save a tiny bit of memory, but double the draw calls.