sjmeyer commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel. URL: https://github.com/apache/incubator-superset/issues/5279#issuecomment-400955052 I don't think the issue is Athena limiting concurrent queries. According to [the documentation](https://docs.aws.amazon.com/athena/latest/ug/service-limits.html) by default you can run 20 SELECT queries concurrently. Is it possible that this issue is with SQLAlchemy? I saw some packages that you can use to run queries in parallel with SQLAlchemy and gevent, but it need some custom code and I only saw the package available for Python 2. Not sure if the current implementation already runs queries for dashboard loading in parallel?
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