Dear Auctex developers,
Whenever an equation contains a "double prime" '', and if the equation
is very far down in a long document, it appears that fontification takes
a very long time. This is not very apparent for short documents, but I
am currently editing a 6000 lines / 360k character long document. Any
keystroke resulting in a change in the affected equation, or even just
displaying that part of the buffer, makes Emacs grind to a halt (on my
machine, it can take 10-15 seconds to process, during which Emacs is
completely unresponsive, including not responding to C-g).
I would guess that Auctex thinks '' is the end of a quote and is looking
for the (nonexistent) double backtick `` that would be the beginning of
it. I tried to get a backtrace with gdb and it's not exactly clear which
precise function is to blame, but it was always as part of the
fontification. As a test, I filled a buffer with some lipsum and put an
equation at the bottom. Without '' everything is fine, as soon as there
is a '' in the equation things start to noticeably slow down.
I am currently using the latest version, 12.2.4, and Emacs 27.0.91. The
behavior is fairly recent, although I couldn't say if it started with
this release precisely, it may have started more than a week ago.
Thanks.
Najib Idrissi
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