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According to some benchmarks, it seems that KaTeX renders latex much more faster than Mathjax.

Is there any chance to use KaTeX in place of Mathjax?

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    $\begingroup$ There has been some discussion at meta.math.stackexchange.com/questions/16809/… $\endgroup$ – Gerry Myerson Sep 22 '14 at 7:27
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    $\begingroup$ There are some concerns, as highlighted in the answers given to the post that Gerry linked to. I'm going to let one of our developers answer this, please be patient :) $\endgroup$ – Tim Post Sep 22 '14 at 9:32
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    $\begingroup$ Although the functionality is currently limited, it seems to be worth keeping an eye on. $\endgroup$ – Todd Trimble Sep 22 '14 at 17:13
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    $\begingroup$ I marked this status-deferred for the two reasons I explained in my answer below. There seems to be no reasonable way to add KaTeX as a MathJax alternative on MO at this time. However, the issue could be revisited once KaTeX improves its functionality and starts offering support for their product. $\endgroup$ – François G. Dorais Sep 22 '14 at 17:24
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    $\begingroup$ See also the discussion with the same title on PhysicsOverflow: physicsoverflow.org/23869/katex-vs-mathjax?show=23970#c23970 $\endgroup$ – Dilaton Sep 23 '14 at 12:23
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Currently, KaTeX supports a limited subset of the functionality provided by MathJax. Many of the missing functionality (notably arrays and equation alignment) is regularly used on MathOverflow, so I would not recommend using KaTeX for viewing MathOverflow.

http://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX http://docs.mathjax.org/en/latest/tex.html#supported-latex-commands

A visual comparison can be found here.

As noted in an earlier discussion, there are also important security issues with adding third-party javascript on MathOverflow. As far as I can tell, the KaTeX developers are not yet offering adequate support for a large site with lots of user input like MathOverflow. They might eventually offer that since they obviously need to support the Khan Academy, which has similar security needs.

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