GNU bug report logs - #1089
Bug report: Hight CPU loading on scrolling

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Package: emacs;

Reported by: Kostafey_Yandex <Kostafey <at> Yandex.ru>

Date: Sun, 5 Oct 2008 15:00:03 UTC

Severity: normal

Merged with 3198

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

Full log

Message #14 received at 1089 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Konstantin <Kostafey <at> yandex.ru>
Cc: 1089 <at> debbugs.gnu.org
Subject: Re: About #1089: Bug report: Hight CPU loading on scrolling
Date: Wed, 06 May 2009 09:21:25 -0400

Konstantin <Kostafey <at> yandex.ru> writes:

> emacs-from-cvs-090503 is not free of this bug.

> If we set scroll 'by line' like this
> (setq scroll-step 1)
>
> we can open rather long file (like emacs tutorial)
> and press down buton for a some peiod of time.
> After some smooth scroll period CPU loading increase,
> so 'glitches' or scroll interrupts take place.

The glitches are likely due to font locking taking place, and the
subsequent garbage collection.  If you disable font lock, you won't see
it.  Also, if you scroll through the file a second time, you also won't
see it.
This bug report was last modified 15 years and 176 days ago.

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