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bug#17404: Scrolling is painfully slow
From: |
Eli Zaretskii |
Subject: |
bug#17404: Scrolling is painfully slow |
Date: |
Tue, 06 May 2014 16:21:29 +0300 |
> Date: Tue, 06 May 2014 15:47:25 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 17404@debbugs.gnu.org
>
> > Date: Tue, 06 May 2014 07:42:47 -0400
> > From: Richard Stallman <rms@gnu.org>
> > CC: 17404@debbugs.gnu.org
> >
> > I should explain that I configured Emacs to visit that file in Rmail mode.
> > Try it that way.
>
> I did. I used "C-u M-x rmail RET foo2.mail RET" in "emacs -Q". Does
> that reproduce the problem on your system?
>
> What about "emacs -nw" -- do you see the same slowdown there? Or is
> the problem limited to the GUI sessions?
Also, could you please try profiling Emacs and reporting the results?
Like this:
M-x load-file RET simple.el RET
C-u M-x rmail RET foo2.mail RET
C-s GNU Emacs
C-f
M-x profiler-start RET RET
Now press and hold C-n for 5 seconds, then release C-n and type
M-x profiler-report RET
In the buffer with the profile, please type "C-u RET" on every line
that has a "+" to its left, to completely expand the profile. Then
please post the result.
Here's my profile:
- command-execute 159 100%
- let 159 100%
- if 159 100%
- let 159 100%
- cond 159 100%
- prog1 159 100%
- call-interactively 159 100%
- next-line 150 94%
- if 150 94%
- if 150 94%
- condition-case 150 94%
- line-move 150 94%
- if 150 94%
- if 150 94%
- if 150 94%
- prog1 150 94%
- line-move-visual 103 64%
- let 103 64%
- or 99 62%
- and 99 62%
- or 99 62%
- and 99 62%
>= 99 62%
- if 4 2%
let 4 2%
let 47 29%
- list 9 5%
- read-extended-command 9 5%
- let 9 5%
- unwind-protect 9 5%
- progn 9 5%
- completing-read 9 5%
- completing-read-default 9 5%
read-from-minibuffer 9 5%
- ... 0 0%
Automatic GC 0 0%
This seems to indicate that line-move and line-move-visual take most
of the time. If you get a similar result, then please try replacing
these 2 functions with their code from May 2013, and see if that makes
the slowdown go away.