derrick
It sounds like you are encountering a performance bug in Maya's Alembic importer. “Face set” is basically the Alembic term for a “group”. Your geometry contains primitive groups called “glass_concentricoutside”, “glass_radialinside”, “glass_radialoutside”, “inside”, and “outside” (these become face sets in the Alembic archive). The “abcecho” command line tool can help you determine what is actually stored in an Alembic archive.
Thanks! That abcecho tool looks helpful. Maya claims they are aware of the bug and it's possible that Maya 2019 has fixed it….