Kamil Wasilewski commented on BEAM-9085:

Thanks [~tvalentyn], great work!

I'll take a look at this in the next couple of days. I'll keep you posted on 
any progress.

> Investigate performance difference between Python 2/3 on Dataflow
> -----------------------------------------------------------------
>                 Key: BEAM-9085
>                 URL: https://issues.apache.org/jira/browse/BEAM-9085
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Kamil Wasilewski
>            Assignee: Valentyn Tymofieiev
>            Priority: Major
> Tests show that the performance of core Beam operations in Python 3.x on 
> Dataflow can be a few time slower than in Python 2.7. We should investigate 
> what's the cause of the problem.
> Currently, we have one ParDo test that is run both in Py3 and Py2 [1]. A 
> dashboard with runtime results can be found here [2].
> [1] sdks/python/apache_beam/testing/load_tests/pardo_test.py
> [2] https://apache-beam-testing.appspot.com/explore?dashboard=5678187241537536

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