[MacPorts] #62913: github: CI jobs: port dependency installation incredibly slow, severely impacting job runtime

[MacPorts]

#62913: github: CI jobs: port dependency installation incredibly slow, severely
impacting job runtime
-----------------------------+-----------------------
  Reporter:  mascguy         |      Owner:  admin@…
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:  github ci
      Port:                  |
-----------------------------+-----------------------

Comment (by mascguy):

 One of the examples cited was for port `nomacs`:

 >The first dependency started installing at 3:33pm:
 >
 >2021-04-24T15:33:40.0051560Z Installing dependency (1 of 265) 'bzip2'
 with variants '' (requesting '') ... [OK]
 >
 >While the last dependency finished installing at 5:27pm, two hours later:
 >
 >2021-04-24T17:22:49.4607320Z Installing dependency (265 of 265)
 'qt5-qttools' with variants '' (requesting '') ... [OK]
 >
 >2021-04-24T17:27:26.6862050Z ##[endgroup]

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Ticket URL: <https://trac.macports.org/ticket/62913#comment:1>
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