Dear all, I've added a new feature to the development version of make4ht (it works in tex4ebook as well). MathJax provides tool named MathJax-node-page [1] for Node.js which can pre-compile a HTML document containing MathML or raw LaTeX to SVG or pure HTML+CSS. This means that the resulting HTML looks like if it was rendered by MathJax, but without need to load any JavaScript, so it renders much faster.
I've put a sample file with basic instructions here: https://www.kodymirus.cz/samples/mathjaxnode/maths.html Some info about possible configuration is available in the make4ht documentation [2]. I hope that this will be interesting for some of you, Michal [1] https://github.com/pkra/mathjax-node-page/ [2] https://github.com/michal-h21/make4ht#the-mathjaxnode-filter-mathjaxsettings
