[MacPorts] #69781: portindex: multi-threading appears bottlenecked for 10.13, 10.12, and perhaps earlier

[MacPorts]

#69781: portindex: multi-threading appears bottlenecked for 10.13, 10.12, and
perhaps earlier
------------------------+--------------------
  Reporter:  mascguy    |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.9.3
Resolution:             |   Keywords:
      Port:  portindex  |
------------------------+--------------------

Comment (by cooljeanius):

 I've noticed this when trying to adapt the MacPorts CI script that runs on
 GitHub Actions with my own local Portfile repository; it results in runs
 taking upwards of 15 minutes to complete...

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Ticket URL: <https://trac.macports.org/ticket/69781#comment:5>
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