jorgecarleitao commented on pull request #9120:
URL: https://github.com/apache/arrow/pull/9120#issuecomment-755962940


   My hypothesis for a slow queue is that it is driven by cost: we simply have 
too many expensive (but unnecessary) jobs running.
   
   1. Every push triggers a 30m+ job (integration tests). Only about 5m of this 
job is the actual testing
   2. jobs are not canceled if there is a push after the push that triggered 
the job, even though those jobs are very likely not relevant once there is a 
new commit / rebase.
   3. there are jobs from language X running on very push to a user's repo, 
even when code for X does not change.
   
   These 3 aspects very quickly fill any queue.
   


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