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

[Deathrey (DeathreyCG)]

@anonymous_user_9d5e1743

Is there a way to quantify that, without actual real world testing? What kind of overhead are we looking at? 2x the cost? 50% additional performance cost? 10%?

Just trying to gauge if it is even worth worrying about, unless the target is very weak hardware.

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.