graceguo-supercat opened a new issue #16528:
URL: https://github.com/apache/superset/issues/16528


   #### How to reproduce the bug
   
   0. As user using Superset for years, 
   1. Go to https://superset.d.musta.ch/superset/welcome/
   2. Welcome page show spinner very, very long time:
   
![kpFvNcc17A](https://user-images.githubusercontent.com/27990562/131545199-87ef745f-04a4-41e2-ac95-e269d7f93696.gif)
   3. from Slow query log, I can see the query to get recent viewed items can 
take > 20 mins.
   
   
   
   ### Environment
   
   airbnb production
   
   - superset version: `superset version`: latest master
   
   ### Checklist
   
   Make sure to follow these steps before submitting your issue - thank you!
   
   - [x] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [x] I have reproduced the issue with at least the latest released version 
of superset.
   - [x] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   Add any other context about the problem here.
   


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