[Bug 203068] Re: Slow scrolling in Epiphany

[Shaun Dennie]

I can confirm this after moving to 8.04 a few days ago.  I posted on the
Hardy messages boards but, I'll simply paste the content of that post
here because it properly explains what I've seen and how I've tried to
fix it.  The original post can be found at
http://ubuntuforums.org/showthread.php?t=750682

----

When trying to use any xulrunner 1.9 browser in Hardy (so, Firefox 3 or
epiphany), I've noticed that just mousing over links causes Xorg to jump
to 100% usage. A great example of this is to go to
http://ubuntuforums.org/ and scroll to the bottom where the massive
logged in users list appears. Just moving the mouse cursor around over
those links will peg Xorg at 100% CPU for me.

I originally noticed the problem while scrolling and, every time a link
would pass under the stationary mouse cursor, scrolling would stutter. I
saw various posts about poor scrolling in FF3 but, once I was able to
reproduce it just moving the cursor over a bunch of links, I thought
this might be fundamentally different.

A couple of notes about this problem:

- Disabling pango via gconf-editor doesn't fix the problem (and, I don't think does anything because normally disabled pango in epiphany makes the fonts look poor and they don't).
- Disabling compiz doesn't fix the problem
- It's not caused by plugins or about:config issues because I started FF3 without a ~/.mozilla directory and the problem persisted.
- In Gutsy, I was using a custom compiled version of epiphany 2.22 built against xulrunner 1.8 (it reports as gecko-1.8 in the about dialog) and it doesn't have this problem at all (including when I use it under Hardy).
- Opera doesn't display this behaviour
- I'm running an nvidia graphics card with the 169.12 drivers. As a test, I tried the 171.06 beta driver. The problem persisted until I enabled the glyph-cache stuff that's mentioned at the bottom of this post and, it didn't improve the Xorg at 100% problem but, mousing over links no longer brought everything to its knees and scrolling was closer to xulrunner 1.8 speed. Unfortunately, this change made much of the rest of the system very unresponsive.
- No amount of fiddling with options in epiphanys Edit->Preferences->Fonts & Style fixes the problem.

Has anyone else seen this? I googled a bit but didn't notice this exact
problem. I'm not sure whether to file the bug under xulrunner, Xorg,
nvidia or even cairo though.

-- 
Slow scrolling in Epiphany
https://bugs.launchpad.net/bugs/203068
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