jedcunningham opened a new pull request, #24262:
URL: https://github.com/apache/airflow/pull/24262

   The calendar view was slow for frequents scheduled DAGs. Iterating the 
timetable with next_dagrun_info added a lot of overhead to the view.
   
   By instead iterating on croniter, we can render the page significantly 
faster. With my test DAG, running every hour for the rest of the year, this 
approach took the page from 12s to under a second.
   
   (In draft as I may have an off-by-1 error, and this isn't tested outside my 
single test DAG)


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