Hi Otterman, I've found out which piece is going too slowly for this delete operation and I'm working on rewriting it to see if I can make it better.

Right now you can run into this particularly if you delete a face that then leaves some disconnnected island kinds of pieces (in your case the letters) and it is being performed on an object made up of many faces.

I think you found this already, but if you select that whole sub-structure of faces (including the interior letters), and then use Edit/Separate, that should go ok and then deleting that face from a smaller object should work better at the moment.

- Michael