Good call on the RBAC templates, will make a fix. 

> Aren't we still making all the same queries?

Queries are slightly different, in the past we made one query per DAG, now it's 
just a single query, so the constant overhead of each query is removed.

> What's the time to the page being fully populated too please?

Locally the time for the page to be fully populated is pretty much instant. 
Prod is within a second, the query is pretty much a more lightweight version of 
the one being used to fetch task instance state so performance shouldn't be a 
concern.

[ Full content available at: 
https://github.com/apache/incubator-airflow/pull/4005 ]
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