I know the whole 'Math rendered by client-side MathJax' question had been argued and debated long ago (read through Task 99369 (Gerrit:212270) ). But I think that was all prior to Extension:SimpleMathjax. This is a really small, easy to implement extension that can be configured to use a CDN or the same host for supplying the MathJax code to the browser. It allows the author to write in TeX, a plus in many peoples opinion, and does not require browser add-ins to display on modern browsers such as Chrome.
It's been about 4 years and I think it may be appropriate to revisit this issue.
Specifically, I'm maintaining a wiki that does NOT have internet access, and frankly, getting Mathoid service running is NOT nearly as simple as SimpleMathJax. First nodejs, then mathoid, then librsvg which requires GTK, and a restbase service? and a compiler? That's when I gave up on Mathoid. Simplemathjax it was just install Mathjax on my server, configure SImplemathjax and done.
By changing the settings in SimpleMathjax ( $wgSmjInlineMath) I was able to have it perform client-side rendering of the math tags very quickly. But, it doesn't seem to be supported inside the Visual Editor. So I was hoping to use this extension and somehow resurrect client-side rendering?