magic-latex-buffer is too slow

[PythonNut]

Related: zk-phi/magic-latex-buffer#20

Alternatives: https://github.com/pretty-mode/pretty-mode, or prettify-symbols-mode.

[PythonNut]

Should fix this before #142 since magic-latex-buffer absolutely nukes font-lock

[PythonNut]

Fun fact: there is no \Chi in LaTeX but MLB has a rule for it.

[PythonNut]

Since 79dc194 this has gotten way worse, but on the other hand I got a faster computer and native-comp seems to help a lot so maybe this issue isn't as important now???