An extension will only get to work when the model is loaded, an importer might tackle the problems before?
simple example:
an ifc file with the size of 2.3 KB will result in a 37MB SketchUp file.KozijnenOnly.zip (388.2 KB)
and it is just a few frames…
Notes
extracted this ifc from a 280 MB file wich would result in a 4.5 GB SketchUp File, theoretically.
SimpleBIM handled that file dead easily… 1 1/2 minutes
A subscription is about the value of Sefaira or Studio…