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Re: Emacs tooooo slow on loooooong line (eat my 2 GHz CPU).


From: Oleksandr Gavenko
Subject: Re: Emacs tooooo slow on loooooong line (eat my 2 GHz CPU).
Date: Tue, 17 Aug 2010 00:18:02 +0300
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0

On 2010-08-16 1:29, Deniz Dogan wrote:
2010/8/15 Oleksandr Gavenko<address@hidden>:
I experiment ever with:

  $ emacs --no-init-file --no-site-file

GNU Emacs 23.2.1 (i686-pc-cygwin) of 2010-05-08 on laptop
GNU Emacs 23.2.1 (i386-mingw-nt5.1.2600) of 2010-05-08 on G41R2F1


When single line is more then 10 KiB long Emacs freeze.

For example try typing (1000 times repeat simple text):

C-SPC int main() {return 0;} SPC M-w C-x ( C-y C-x ) C-u 1 0 0 0 C-x e

After text appear in buffer try move up/down by this text.
My CPU loading up to 100%.

Cygwin Emacs in mintty work near 2x time faster
then Emacs native in gui.


Currently I found longline-mode. With such settings:

(setq longlines-show-hard-newlines t)
(longlines-mode 1)

it is speedy but not so visual convenient
as default line wrapping mechanism.


Also I try visual-line-mode. It also very slow!


I try Emacs 21.3 and found that there no such feature as
moving to wrapped part of line by one line. Instead if I
press UP or DOWN in go to new line. And very fast!
Same with Emacs 22.3.

How back previous behavior on long line moving or fix
current?
Back to previous behavior done by:

  (setq line-move-visual nil)


For what it's worth the sluggishness is a known issue and was reported
the first time a while back:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3219

Thanks for pointing.

Also I found useful related links in

http://xahlee.org/emacs/emacs_line_move_visual.html


Note that cursor movement at the end on very long line
eat many CPU cycles. At the beginning lesser.

--
Best regards!




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