avkirilishin commented on pull request #21214:
URL: https://github.com/apache/airflow/pull/21214#issuecomment-1030277456


   I did load testing today, and it turned out that now the scheduler consumes 
a lot more CPU, since it constantly selects all the necessary DAGs in the 
`DagModel.dags_needing_dagruns` function. Maybe I can add a dict with the time 
of the last check? But it won't work for `AIRFLOW__SCHEDULER__NUM_RUNS = 1`


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