I'll only comment on the last questions. If your game engine uses static batching then there will be no discernible difference. However without batching the 9 meshes whould be about 9 times slower. The GPU slows down for each draw call. Another issue to take into consideration is that the more the geometry and UV verts are…
I'm not sure if I worded the title right, but if anyone who knows how the technical stuff works could shed some light on a question I had. If I have a mesh, lets say for instance it's a brick wall. We'll say the wall is made out of 9 bricks. The high poly has been baked to a plane and you have your texture for the wall.…