GLB File Is More Than 10 Times Larger Than Its STL Version

[EmetsVad]

Export to glTF generates a file of about 700 MB,
even though the corresponding STL file is about 60 MB.
The TopoDS_Compound with triangulated faces is the same for both exports.
IfcOpenShell GltfSerializer generates the file of about 70MB

OCCT 7.9.2

Handle(TDocStd_Document) document = new TDocStd_Document("GLTF-Document");
Handle(XCAFDoc_ShapeTool) shapeTool = XCAFDoc_DocumentTool::ShapeTool(document->Main());
shapeTool->SetAutoNaming(Standard_False);
shapeTool->AddShape(compound, Standard_False, Standard_False);
RWGltf_CafWriter writer(outputGltfFile.c_str(), true /*isBinary*/);
writer.SetTransformationFormat(RWGltf_WriterTrsfFormat_Compact);

writer.SetNodeNameFormat(RWMesh_NameFormat_Empty);
writer.SetMeshNameFormat(RWMesh_NameFormat_Empty);
writer.SetForcedUVExport(false);
writer.SetToEmbedTexturesInGlb(false);
//writer.SetMergeFaces(true);
writer.SetSplitIndices16(true);
writer.SetForcedUVExport(Standard_False);
writer.SetToEmbedTexturesInGlb(Standard_False);

[dpasukhi]

Dear @EmetsVad Please share your files. If file contains 1 face per triangle - it is expected behavior, becase GLTF try to follow original structure of topology.
STL merge all existed triangles into one and simplify model.
Ifc I'm not sure how to manage mesh, maybe it also merge it or maybe you have BRep representation.

[EmetsVad]

Hello @dpasukhi, I was waiting for permission to share the file and here is he the link: https://drive.google.com/file/d/1wgVD5O-BTXRzAVAPYr5RgbTvSYyLrJ_f/view?usp=drive_link .
Could you please take a look at it.