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

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Package: emacs;

Reported by: Gregory Heytings <gregory <at> heytings.org>

Date: Thu, 21 Jul 2022 18:01:01 UTC

Severity: normal

Done: Gregory Heytings <gregory <at> heytings.org>

Bug is archived. No further changes may be made.

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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 <at> heytings.org
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Sat, 23 Jul 2022 11:46:37 -0400

>> AFAIK if the buffer has not been modified (including things like
>> changing `window-start` or `point`), then a redisplay will just not
>> run jit-lock (and hence font-lock) at all, no matter how thorough.
> But the fact is without font-lock the response is faster by a large
> factor.  So something, somewhere, still depends on font-lock.

Yes, that's the part that we need to explore.
Maybe font-lock *is* run somehow?
Or maybe it's just the mere presence of text properties?  (Or overlays?)


        Stefan
This bug report was last modified 2 years and 8 days ago.

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