What are the performance implications writing the Company Percent formula as:
PY Sales / PY Sales.PY Sales[SELECT: 'Geos L1'.Total Company]
PY Sales / Company Goal Set.PY Sales
In this specific model? Probably nothing since it's so small and light. I suspect, however, that you're actually asking about the larger implications of using a SELECT function versus directly referencing. I'm going to add a few screenshots for the data in question and see if I can't get someone else to help answer.