We were a small government hospital with huge outpatient clinics, if you consider a 183 bed hospital seeing 100,000 outpatient events/ year as huge clinics.
There definitely is an art to moving those numbers with smaller numbers of staff. You have to have ancillary services firepower. Fast throughput and as much automation as the budget will support. For example, our pharmacy filled an average of 700 ninety-day scrips per day. You don't do that without three pharmacists, a robot and a half-dozen pharm techs.
You have to have good clinic triage at the ED or Urgent Care point to line this stuff up. And Resource Scheduling worked wonders.
The biggest problem clinic was Internal Medicine, but those patients tended to be older and sicker. We could only do an average of 28 patients/day for docs in that clinic, a bit less for the NP's. The docs might could have handled a few more, but if you're a NP with a question or bad patient and the Doc is 20 feet down the hall...