Performance cost of double sided material: not visible in stats?

[anonymous_user_c94f194d]

Roughly double cost of rasterisation and fragment shader.
May sound scary, but you might even not be able to measure this difference in a practical scene, so little it can be. It all should be viewed in a context, not as an absolute.

Double is worst case. Depth buffering should reduce overhead cost in average case by half with convex models and even more with complex models with multiple layers.