Unity why is a Quad slower than a Cube?

Hi I've developed a simple Cube based benchmark called Cubemark in Unity and I also made a simple Quad based version. The problem is I have now combined them into one web app and now there is a stark difference in performance (see) below in the number of Quads and the number of Cubes Unity can display.

Quads: 10290
Cubes: 20420

The Quads are a 4 point, 2 triangle Quad created in Blender ( Add Cube, Chop off top).
The Cubes are the default Unity Cubes.

I'm looking into it but any ideas why this might be the case?

 

I've got it I'm using StaticBatchingUtility.Combine to improve performance which works fine on the Cubes as it massively reduces the drawcalls but fails on Quads. Think I've got it still not getting comparable results Quads only up to 14k?

 

Did you optimize the mesh to make triangle strips? It would be interesting to know if cubes actually are faster than a custom quad mesh because that might provide a big speed boost to 2d games.

 

I'd be interested to see if this has changed now that Unity doesn't need to import quads.

 

Just tried a test run and converted from imported quad to in built quad and there was no performance difference.

It could be the difference in the test as the rotation goes from 3d to 2d this could impact the volume of cubes/quads being viewed/frustum culled.