I am kind of syntax agnostic and would be happy to use more complicated syntax in exchange for more power. (I have a lot of HTML inside my Markdown files, too.) However, my use of rST has been in Sphinx, and I want to love it because it's quite powerful, but it's so slow. Am I missing some configuration or third party package to fix this? I wrote about 15k words of English text in rST in Sphinx to document a project[^1], and Sphinx's build speed was many times more an impediment than my unfamiliarity with rST.

[1]: https://pages.micahrl.com/progfiguration/