BRepBuilderAPI_GTransform makes boolean operations slow.

Hi,

I was trying to make some boolean operations with simple solids like box. The operation required much more time when the box was transformed with BRepBuilderAPI_GTransform. However, when I used BRepBuilderAPI_Transform the operation was much faster.

For example:

TopoDS_Shape box = BRepPrimAPI_MakeBox( 2, 2, 4 );
TopoDS_Shape cyl = BRepPrimAPI_MakeCylinder( 0.9, 3 );
gp_GTrsf gtr;
gtr.SetTranslationPart( gp_XYZ( -1., -1., 0. ) );
gp_Trsf tr;
tr.SetTranslationPart( gp_Vec( -1., -1., 0. ) );
if ( 1 ) box = BRepBuilderAPI_GTransform( box, gtr );
else box = BRepBuilderAPI_Transform( box, tr );
shapeResult = BRepAlgoAPI_Cut( box, cyl );

I have checked the structure of the box after the transformation and BRepBuilderAPI_GTransform turned the faces of the box into BSpline faces.

My question is: Can I use non-uniform transformation without having the faces turned into BSpline faces? (I would like to reach higher speed and use different x, y, z scale factors.)

Thanks,
Tibor.