Hey John --
Scheduled Refreshes only pertain to data sources which are backed by a Tableau Data Extract (TDE - an in-memory cache which improves performance). However, the TDE isn't supported againt an SSAS data source, so this won't help you.
Based on what you've written, it sounds like the cube itself isn't answering questions very quickly? It might be worthwhile to capture a Performance Recording to "see" where all your time is going: