GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 56682 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>, dgutov <at> yandex.ru
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 02 Aug 2022 03:48:09 -0400

> used, for some reason) jit-lock-defer feature: if you set
> jit-lock-defer-time to a large enough value, M-> followed by C-p will
> not be as slow as they are now, I think.

I think currently, with such a setting, in Gregory's example, the 50s of
`syntax-ppss` will still bite the users because they're uninterruptible,
although if the users happen to leave Emacs idle at the right time they
may not notice.

We could/should make sure the 50s are done "in the background" and can
be interrupted at any time.


        Stefan

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