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

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Message #113 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 56682 <at> debbugs.gnu.org, gregory <at> heytings.org, monnier <at> iro.umontreal.ca,
 visuweshm <at> gmail.com
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Sat, 23 Jul 2022 20:44:43 +0300

> From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
> Cc: 56682 <at> debbugs.gnu.org,  gregory <at> heytings.org,  monnier <at> iro.umontreal.ca,
>   visuweshm <at> gmail.com
> Date: Sat, 23 Jul 2022 19:23:40 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Font-lock Scroll-bar Composition Output
> >> ------------------------------------------------------------
> >> on	  on	     on		 GCs: 14 Elapsed time: 7.276626 seconds
> >> on	  off	     on		 GCs: 1 Elapsed time: 5.363002 seconds
> >> on	  off	     off	 GCs: 1 Elapsed time: 3.967520 seconds
> >
> > Thanks.  How about now, after I installed the last change?
> 
> Font-lock Scroll-bar Composition Output
> ------------------------------------------------------------
> on	  on	     on		 GCs: 16 Elapsed time: 5.496764 seconds
> on	  off	     on		 GCs: 1 Elapsed time: 5.362916 seconds
> on	  off	     off	 GCs: 1 Elapsed time: 3.947306 seconds
> 
> That's with
> 280b8c96cc origin/feature/long-lines-and-font-locking Improve display of columns on mode-lin

Thanks.  So the scroll-bar effect is largely gone, and font-lock is
now just 25% slower than no-font-lock.  Which I think is reasonable,
given that there's a face change every 10 to 20 characters?

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