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@gescheit, thanks for your PR! By analyzing the history of the files in this pull request, we identified @ncoghlan, @serhiy-storchaka and @hynek to be potential reviewers.

Changed the CLA label as @gescheit is recorded as having signed it in Roundup: https://bugs.python.org/user15300

Thanks @gescheit, changes looks good to me!
I think adding a NEWs entry would be good too, don't you?

What is performance boost?

@asvetlov you can find numbers in the description of the BPO.

Got you. Thanks.
Could you please add a NEWS entry?
https://devguide.python.org/committing/?highlight=blurb#what-s-new-and-news-entries

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

Ping @gescheit . This seems to be blocking only on NEWS entry. Can you please add one? It would be nice to see this as part of next release. You can add it from the web interface using https://blurb-it.herokuapp.com/ or using the blurb tool at https://pypi.org/project/blurb/

Thanks