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If you are going to use GA you WILL experience severe and unacceptable performance issues, especially if your users and builds are predominantly in the EU/US time zone (this is the case for most of the biggest projects using GitHub Actions). 
Apache Airflow (Tobiasz Kędzierski, a contributor to Apache Airflow ) built a very crude dashboard showing the use of GA workflows (it's not jobs but workflows) which clearly shows the extent of the problem.

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This chart is imperfect - we currently do not have details "per-job" because GitHub is unable to give us the data. We've asked for it at the meeting organised by INFRA on 14 January, 2021, with people from GitHub Actions present, but (at least I am not aware of it) we do not have the data from GitHub available in a usable way (neither as raw data, nor dashboards). The meeting notes and preparation are here (no meeting notes yet available though): ASF Build Infra Meeting 14th of Jan 2021.

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