[Bug 155215] slow scrolling on all pages - Gutsy

[Jon Wilson]

Public bug reported:

Binary package hint: mozilla-firefox

I just upgraded my existing Feisty system to Gutsy in place (sudo do-
release-upgrade).  Now scrolling in Firefox 2.0.0.6 using the mouse
wheel, arrow keys, or pgUp/Dn is very very slow and jerky, and uses up
100% of my CPU cycles for several seconds.  The length of time that the
CPU is occupied for seems to vary independently of how far I scroll.
Grabbing the scroll bar and dragging it up and down seems to be affected
by this issue too, but less so, and so it performs acceptably.  This
occurs on all pages (all pages long enough that I can scroll on them,
that is), including locally-stored plain text files.  Disabling (but not
uninstalling) all extensions has no effect.  The only themes I have
installed are the default Firefox theme and the three Ubuntu themes.  I
do have Ubufox installed (but I did disable it, to no avail).  My plugin
list (gleaned from about:plugins) is:

      File name: libflashplayer.so
      File name: libflashplayer.so
      File name: libtotem-basic-plugin.so
      File name: libtotem-gmp-plugin.so
      File name: libtotem-mully-plugin.so
      File name: libtotem-narrowspace-plugin.so
      File name: libjavaplugin_oji.so
      File name: mplayerplug-in-dvx.so
      File name: mplayerplug-in-qt.so
      File name: mplayerplug-in-rm.so
      File name: mplayerplug-in-wmp.so
      File name: mplayerplug-in.so
      File name: libflash-mozplugin.so

Now that this text box has gotten full enough to have its own scrollbar,
I observe the same behavior (using the mouse wheel) when scrolling the
text box.  I have seen several other bugs which involved this issue only
on some webpages, and generally they are older bugs, while this is
clearly a new issue.  I was running Firefox 2.0.0.6 prior to the Gutsy
upgrade with no problem.  I have also tried

$ export MOZ_DISABLE_PANGO=1
$ firefox

, as recommended in Bug #74116, but this did not help either.

** Affects: mozilla-firefox (Ubuntu)
     Importance: Undecided
         Status: New

-- 
slow scrolling on all pages - Gutsy
https://bugs.launchpad.net/bugs/155215
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