#2375 BLOC Untriag: Aweful performance on CJK webpage font rendering

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#2375: Aweful performance on CJK webpage font rendering
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 Reporter:  YChao        |       Owner:  marco    
     Type:  defect       |      Status:  new      
 Priority:  blocker      |   Milestone:  Untriaged
Component:  web browser  |     Version:           
 Keywords:               |    Verified:  0        
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 I'm testing on a newly arrived BTest-4 machine. Both 406.14 (come with B4)
 and 406.15 (updated) OS images are checked.

 After copying a CJK true-type font to /usr/share/fonts/., the web and
 write app can display CJK fonts correctly. However, the performance of it
 is terrible bad. I can hardly open http://tw.yahoo.com ,
 http://www.google.com.tw/ig . That of 406.15 os seems to be slightly
 better but still bad: http://news.yahoo.com.tw will keep CPU 100% loaded
 for 30s~1m and page up/down would take 3+ sec. Similar problem also
 happens for Japanese pages with tons of text (w/ few images). Web pages
 refreshing with lots of text in english is also slow but not so
 significant. One can easily reproduce the problem with following two
 pages:
 http://web.mit.edu/yenjie/www/lm/physics/phys-field-string-2.htm (chinese
 page by my friend)
 http://wiki.fdiary.net/font/?stolenbitmap (japanese text only)

 Also fonts can use the FC6 CJK fonts (checked some already) or d/l from
 here:
 ftp://ftp.opendesktop.org.tw/odp/ODOFonts/OpenFonts/opendesktop-
 fonts-1.4.2.tar.gz

 I'm not sure if the web browser app. uses Cairo to render fonts, but it
 has a significant performance impact on my daily used thinkpad notebook
 running FC5. Not sure if this is of the same cause. I've tried firefox
 2.0.0.5 tar-ball on XO and didn't met this problem.

-- 
Ticket URL: <https://dev.laptop.org/ticket/2375>
One Laptop Per Child <http://laptop.org/>