mistercrunch commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel. URL: https://github.com/apache/incubator-superset/issues/5279#issuecomment-400049056 We typically run with single thread and many workers as it's unclear what it would take to get sqlalchemy to work nicely with thread. Have you tried that option, say `-w 16` and no `--threads {}`?
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