From: Ravine Var <ravine.var@gmail.com>
To: Alan Mackenzie <acm@muc.de>
Cc: 45248@debbugs.gnu.org
Subject: bug#45248: 28.0.50; Emacs freezes with big C functions
Date: Wed, 23 Dec 2020 08:48:26 +0530 [thread overview]
Message-ID: <87mty5rxsz.fsf@gmail.com> (raw)
In-Reply-To: <X+JZqNjn329wSMf/@ACM>
Alan Mackenzie <acm@muc.de> writes:
> Sorry it's taken a little while to reply. I've been preoccupied with
> another bug in the meantime.
No problem.
> By "scrolling becomes slower", do you mean (1) that the time for an
> isolated single full screen scroll becomes longer, the further you are
> through that struct? Or do you mean (2) that on auto-repeat of the C-v
> or PageDown key, the scrolling becomes slower?
The second behavior. Opening the file and scrolling from the
the beginning with C-v becomes progressively slower.
> If you mean (2), from emacs -Q without enabling
> fast-but-imprecise-scrolling, then you are just seeing the normal
> expected, but unfortunate behaviour of Emacs: Emacs will not redisplay a
> screen as long as there is keyboard input unprocessed, but Emacs is
> spending its time fontifying the intermediate screens (which are not
> about to be displayed) as part of processing that input. 30 characters
> per second is faster than CC Mode can paint a single screen.
Ok.
> For problem (2) I recommend, again, enabling
> fast-but-imprecise-scrolling.
Without the patch in message 11, scrolling is bad
even when fast-but-imprecise-scrolling is enabled.
With the patch, things are much better and there
is no lockup, once fast-but-imprecise-scrolling is enabled.
I think this is enough for this bug - thanks for
looking into this issue.
next prev parent reply other threads:[~2020-12-23 3:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-15 3:59 bug#45248: 28.0.50; Emacs freezes with big C functions Ravine Var
2020-12-15 16:05 ` Eli Zaretskii
2020-12-17 15:08 ` Alan Mackenzie
2020-12-18 11:17 ` Ravine Var
2020-12-18 17:29 ` Alan Mackenzie
2020-12-19 4:28 ` Ravine Var
2020-12-22 20:40 ` Alan Mackenzie
2020-12-23 3:18 ` Ravine Var [this message]
2020-12-24 11:50 ` Alan Mackenzie
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