[Bug 32561] Re: Pango-enabled firefox is much slower

[Alexey Spiridonov]

I am seeing this on 7.10 Gutsy Gibbon, Firefox 2.0.0.11, and it showed
up in a very nasty way. I have an e-mail (see attachment) with lots and
lots of text (data files). Opening this e-mail in its original context
-- Yahoo mail with its CSS and JS and tables -- caused the browser to
effectively hang. It remained non-responsive and at 100% CPU for over 5
minutes. The sanitized version does eventually render, but takes over a
minute on my computer. In contrast, with pango disabled (I started with
mozilla.com's stock builds, then tried the MOZ_PANGO_DISABLE=1 hack,
both work fine), the original e-mail renders in about 15 seconds. The
sanitized version renders in about 3. So, using Pango is over 20 times
slower for me!

On the other hand, the font rendering without Pango does not match the
rest of the system (fonts are different/larger; some are badly hinted).
So, it's ugly without Pango, and unstable (yes, unstable, because such a
hang makes me kill the browser) with. :(

Can I do something to help get this fixed?

** Attachment added: "Sanitized e-mail with massive performance problems."
   http://launchpadlibrarian.net/11088176/firefox-performance.html.gz

-- 
Pango-enabled firefox is much slower
https://bugs.launchpad.net/bugs/32561
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