Importing .brep files - slower in my application than in Salome or FreeCAD

Hi guys,

I have a small performance problem with reading .brep files in my application.

Basically, what I observe is that both Salome and FreeCAD import my .brep files way faster than my own application built using Openacascade 6.7.1 - it takes less than 10 seconds for them while even for my simplest test application which only loads this .brep file - it takes 28 seconds. I looked at the Salome code and it seems that I use the same approach - i.e. BRepTools::read(). Additionally, Salome manages to also mesh the surface for visualization in those 10 seconds, which I don't do.

Any ideas on why this might happen? Perhaps there are some flags for building Opencascade that I am missing? I have tried building with TBB, but setting MMGT_ options to various values don't seem to change the performance of this operation.

The platform is MSVS 2013, Win 7 x64.

Thank you for any ideas,
Rostislav.

PS: this is kind of a cross-post from Salome forum. I hope that this is ok.

The test app code is as simple as:

#include
#include
#include

#include
#include

void main()
{
auto start = std::chrono::high_resolution_clock::now();
TopoDS_Shape s;
BRep_Builder b;
BRepTools::Read(s, "big_model.brep", b);
std::cout (std::chrono::high_resolution_clock::now() - start).count() }