HLR for 10-20 times faster

Hi guys,
The HLR algoritm (not Poly) is really working for 10-20 times faster when we put the sewed shape in.

for the sample:

...
Handle_HLRBRep_Algo myHlAlgo = new HLRBRep_Algo();
BRepBuilderAPI_Sewing mySewing(1.0e-06,true,false,false,false);

for(aListIterator.Initialize(aList);aListIterator.More();aListIterator.Next())
{
...
mySewing.Add(myShape);
}

mySewing.Perform();
myHlAlgo->Add(mySewing.SewedShape(),0);
myHlAlgo->Update();
myHlAlgo->Hide();
...

In this jpg-image without optimization I'm need wait for 10 seconds while building HLR, but now only 0.91 of second.