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https://issues.apache.org/jira/browse/AIRFLOW-2777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601286#comment-16601286
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Apache Spark commented on AIRFLOW-2777:
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User 'abdul-stripe' has created a pull request for this issue:
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
>             Fix For: 2.0.0
>
>
> 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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