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

From: Oleksandr Gavenko
Subject: Emacs tooooo slow on loooooong line (eat my 2 GHz CPU).
Date: Mon, 16 Aug 2010 00:04:39 +0300
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20091204 Thunderbird/3.0

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

Best regards!

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