ebauch opened a new issue #9894:
URL: https://github.com/apache/incubator-superset/issues/9894


   A clear and concise description of what the bug is.
   
   When SQL lab auto-generates a preview of a table, the GUI freezes if this 
table is large. 
   
   ### Expected results
   
   Generate no preview to not crash the Sql lab tab/gui. 
   
   ### Actual results
   
   The sql lab preview is generated but because the table is large the 
browser's local storage is limited immediately and the GUI freezes/comes to a 
crawl. 
   
   #### Screenshots
   
   I think it is related to this 
   
   <img width="369" alt="image" 
src="https://user-images.githubusercontent.com/3758223/82733208-502daf00-9ce0-11ea-8e97-ee50b426df4a.png";>
   
   #### How to reproduce the bug
   
   1. Go to 'SQL Label'
   2. Click on schema -> public
   3. Click on table -> select some large table
   4. See GUI freezing
   
   ### Environment
   
   (please complete the following information):
   
   - superset version: `0.30.0`
   - python version: `3.7.5`
   - node.js version: `10.17`
   - npm version: `6.11.3`
   
   ### Checklist
   
   Make sure these boxes are checked 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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