Import a file with background worker

Hi Objo!
Your library is amazing!

I couldn't import a model, with the ModelImporter, using a thread or task. It's cause a exception in Viewport3D.
While the thread is reading and the file size is too big, the main window not respond.
I think it is because the Model3DGroup is frozen.

I don't know as do that.
You can help me?

Thank you very much.
Thiago Aguirre Lorscheiter