its fine, actually its a game level for IOS,we make an cinematic trailer for that game i was convert the all mesh into high poly most of the mesh were good its happen all of the foliages and same static mesh like tress i use tropical tress pack on marketplace,one more thing the building and props on that level are not cast shadows itself,i use directional light with no raytace shaodw on it use cascade/distacne field shaodows