[docutils:patches] #206 Improve SmartQuote performance

- **status**: open --> open-fixed
- **Comment**:

Applied in [r9479]. More optimizations in [r9480] and  [r9481]



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**[patches:#206] Improve SmartQuote performance**

**Status:** open-fixed
**Group:** None
**Created:** Wed Aug 16, 2023 04:37 PM UTC by Chris Sewell
**Last Updated:** Sun Nov 19, 2023 09:32 PM UTC
**Owner:** nobody
**Attachments:**

- [0001-Pre-compile-smartquote-regexes.patch](https://sourceforge.net/p/docutils/patches/206/attachment/0001-Pre-compile-smartquote-regexes.patch) (8.3 kB; application/octet-stream)
- [sphinx-build-after.svg](https://sourceforge.net/p/docutils/patches/206/attachment/sphinx-build-after.svg) (199.1 kB; image/svg+xml)
- [sphinx-build-before.svg](https://sourceforge.net/p/docutils/patches/206/attachment/sphinx-build-before.svg) (282.1 kB; image/svg+xml)


Performing a representative sphinx-build (10 x docutils/docs/ref/rst/restructuredtext.txt, dummy builder), and analysing with py-spy, you can see from the attached flamegraph that the smartquote transform accouts for over 22% of the build time!

This PR attempts to improve that situation (at least down to 18%) by caching regex compilation 


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