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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.

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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.

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