I recently noticed that enabling shadows (hard shadows only, low resolution, close fit, no cascades) increases the triangles/vertices count by 60-70%. Initially I have like 25k triangles on stage and upon enabling shadows they become 39k. Same applies to vertices, they increase too. The only lights that are there is 1 directional light and also global illumination with gradient. This is viewed in the "Stats" popup in the Unity editor. As far as I know, shadows should create a shadow map that is applied onto the meshes that receive the shadows. I have no clue why it increases the tris/vertices count. Is there something that I miss?