tani...@ss.iij4u.or.jp writes:

> When the variable `org-highlight-latex-and-related' is set to `(latex)',
> opening an Org file and inserting or deleting characters may cause too
> much time lag, making text editing difficult.

Thanks for reporting and for providing the detailed analysis!
This is a known bug caused by overly complex regexps in
`org-latex-regexps'. See
https://list.orgmode.org/orgmode/F1IQSiX3SvGn1zq4pzoQ669N8S-qTDWNBWKuZpH9wQi8P_vjDSzgUHnLgxu5kuaDCyFmvjPt3e6rrd7YiO7wi5U_4ZdGtXMpZVkuqgZmBSU=@williamdenton.org/

> Versions prior to `80268c0e075bb69e7890146a8d7240e920fc786c' specify the
> argument `BOUND' for `re-search-forward', so they are less likely to be
> affected by file size and distance to the next LaTeX formula.

Yeah, but dropping BOUND was intentional. It fixed some edge cases with
incorrect fontification.

-- 
Ihor Radchenko // yantar92,
Org mode maintainer,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

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