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https://issues.apache.org/jira/browse/AIRFLOW-2777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16551422#comment-16551422
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Abdul Nimeri commented on AIRFLOW-2777:
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https://github.com/apache/incubator-airflow/pull/3621
> dag.sub_dag(...) speedups
> -------------------------
>
> Key: AIRFLOW-2777
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2777
> Project: Apache Airflow
> Issue Type: Improvement
> Reporter: Abdul Nimeri
> Assignee: Abdul Nimeri
> Priority: Minor
>
> dag.sub_dag(...) currently works by first deep copying the entire dag, and
> then filtering down to the appropriate tasks. that can be slow since deep
> copying a big dag takes a while. specifically, copying over all the tasks is
> the bottleneck
> this can be a lot faster by instead only copying over the filtered down tasks
>
>
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