A polygon of Mesh ‘“”“”’ in “”“”“” fbx is self-intersecting and has been discarded.
What are the consequences, will there be a heavy loadtime or just that some points were discarded ?
This error basically just means that there were redundant polygons in the mesh and they have been deleted. There will be zero consequences from this error as it has already been dealt with. 
So when i got like 50 buildings in the scene and everyone has this issue there will be no problem with the loading times while removing all the polygons :D?
I find the material and change its “Shader” to standard, then the issue resolved.Hope this can help you.