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23.1.92: cursor movement in Korean text is slow with xfonts-baekmuk

From: Jae-hyeon Park
Subject: 23.1.92: cursor movement in Korean text is slow with xfonts-baekmuk
Date: Fri, 19 Feb 2010 00:28:50 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)


I would like to draw your attention to a problem that I reported a few
months ago.  It can be found at https://bugs.launchpad.net/bugs/471597
The report is about emacs 23.1 but I still have the same problem with
the pretest version 23.1.92.  It is weird that this symptom occurs
only if I use the particular bitmap font, baekmuk.  However, this font
causes no trouble when I am using emacs 22.  For your convenience let
me copy the text below.  The attached file is available at the above
link.  Thank you.

Jae-hyeon Park

Binary package hint: emacs23

Source package: emacs23
Ubuntu release: 9.10 amd64
Package version: 23.1+1-4ubuntu3

I use the bitmap font xfonts-baekmuk to display Korean characters in emacs. 
When there are many Korean characters in a buffer, moving the cursor among the 
Korean characters takes a long time (like a few seconds on my laptop which is a 
fairly new hardware).

How to reproduce:

1) Start emacs with

    $ emacs23 -Q -xrm 'Emacs.FontBackend: x' &

2) In the scratch buffer, evaluate the following code

    (set-fontset-font "fontset-baekmuk" 'korean-ksc5601
    (set-frame-font "fontset-baekmuk")

3) Open the attached file in the same frame

4) Try to move the cursor downwards by pressing C-n several times

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