title: Apache Superset - Concurrent loading of dashboard slices (Athena)
body: <p>I've got a dashboard with a few slices setup. Slices are loading one after the other, not concurrently. This results in a bad user experience. My data is sitting on S3 and I'm using the Athena connector for queries. I can see that the calls to Athena are fired in order, with each query waiting for the one before it to finish before running.</p>
  
  <p>I'm using gevent, which is far as I can tell shouldn't be a problem?</p>
  
  <p>Below is an extract from my Superset config:</p>
  
  <pre><code>SUPERSET_WORKERS = 8
  WEBSERVER_THREADS = 8
  </code></pre>
  
  <p>It used to be set to 2 and 1 respectively, but I upped it to 8 each see if that could be the issue. I'm getting the same result though.</p>
  
  <p>Is this a simple misconfiguration issue or am I missing something?</p>