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From: ASSI <Stromeko AT nexgo DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] emacs 27.1-1
References: <announce DOT 20200811124856 DOT 46307-1-kbrown AT cornell DOT edu>
 <87pn7srlrf DOT fsf AT Rainer DOT invalid>
Date: Sun, 16 Aug 2020 08:06:05 +0200
In-Reply-To: <87pn7srlrf.fsf@Rainer.invalid> (Achim Gratz's message of "Sat,
 15 Aug 2020 17:07:00 +0200")
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Achim Gratz writes:
> This release seems to have a serious performance regression when using
> diff-mode on large diffs with long lines (e.g. created by comparing the
> logs of two compilations), especially when combined with
> toggle-truncate-lines.  Emacs becomes unresponsive with 100% CPU load
> when scrolling fast, sometimes for several seconds.  The CPU time seems
> to be spent in redisplay().

I've finally dug out the respoinsible change in NEWS.  It turns out this
is the fallout from a new default: a customization named diff-refine has
come into existence and its default is 'font-lock.  Set it to either nil
to never refine automatically or the select the old behaviour with
'navigate and the scrolling works much better now.  It still feels a tad
slower than it were, but that might well be due to some other changes to
how diff-mode fontifies.


Regards,
Achim.
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