Scaling meshes - better performance if uniform

[Rastar]

I am scaling planar (ie y=0) mesh patches for a simple terrain using heightmap displacement in the vertex shader. Is there a performance difference between uniform scaling

 

mesh:SetScale(scale, scale, scale)

 

and non-uniform one

 

mesh:SetScale(scale, 1, scale)

 

? I remember reading somewhere (non Leadwerks- related) that uniform scaling would perform better, but can't actually see why.

[YouGroove]

Generally in 3D engines, no scaling at all even on models is the best way, the faster.