[Bug 74116] Re: Very slow and jerky scroll renders browser useless

Alexander Sack asac at jwsdot.com
Wed May 14 10:40:49 UTC 2008

On Thu, May 01, 2008 at 05:13:40PM -0000, Jimt wrote:
> I can confirm this behavior on Ubuntu 8.x with Firefox 3.0b5.
> For me, the slow scrolling seems to be limited to websites with a significant amount of CSS layout.
> To test this, I have installed the Firefox Web Development Add-on which
> offers some tools to test out the CSS in a given page.
> With CSS turned on normally, the scrolling is really slow and very jerky.
> As soon as I disable all CSS parsing for the page, scrolling immediately improves to the way it should work. Smooth and fast.
> Compiz/Xgl does not seem to affect anything, whether I use the lowest
> Appearance settings or anything else.  Disabling Pango does not have any
> effect either,
> The only improvement I get is by disabling CSS altogether.

please try to remove repeated backgrounds or special borders (dotted
and such) from CSS and see which causes your performance issues.

 affects ubuntu/firefox
 status wontfix

 affects ubuntu/firefox-3.0
 status incomplete

 - Alexander

** Changed in: firefox (Ubuntu)
       Status: Incomplete => Won't Fix

** Also affects: firefox-3.0 (Ubuntu)
   Importance: Undecided
       Status: Incomplete

Very slow and jerky scroll renders browser useless
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