ComputeScaledMesh performance

Hi all,
I am experiencing some performance problems and I have started to check them with unity 2.6 profiler.
Actually, as soon as possible, I will of course use the iPhone profiler, but I was wondering if and how I can reduce the impact of the call:

Code (csharp):

1. MeshRenderer.ComputeScaledMesh

Is this caused just by scale factors set in the unity scene editor?
Will I lower its impact if I pre-scale meshes in import settings?

Many thanks.

 

Up to a given degree. don't forget that changes to the scale affect all child transforms and require them to update their data on each transform update again