[Bug 125970] Re: slow scroll with image in the background

[Nicolò Chieffo]

** Description changed:

  Binary package hint: firefox
  
- firefox 2.0.0.4+2-0ubuntu3
+ firefox 2.0.0.6+2-0ubuntu4
  
  I've found that scrolling is slow in all sites (comparing to windows), but really slower in sites where there is a static image that does not move when I scroll
- this is a css example
+ site example:
+ http://www.starcraft2.com/
+ http://railsdojo.wordpress.com/
+ http://www.oakparkfoundation.org/
  
+ I think that this .css is the cause of the problem
  body { 	background-color: #fff;
  background-image: url("images/rubric/gradient.gif"); 
  background-attachment: fixed; 
  background-position: bottom; 
  background-repeat: repeat-x; }
- 
- site example:
- www.starcraft2.com
- http://railsdojo.wordpress.com/
  
  this problem is empathized when using compiz.
  The problem is present with both radeon  and nvidia video cards, even when compiz is disabled
  
  This problem is less invasive if using firefox downloaded from mozilla.com (without ubuntu patches) or swiftfox, but it is still present
  Scrolling in windows XP is really faster (when I say really I mean at least 10x in the starcraft site, which is the site that has most slowdown problems), even in sites that does not have a background image
  
  Other tests
+ epiphany 2.19.5-0ubuntu1: same slowdown as firefox
  konqueror 3.5.7-1ubuntu10: much more reactive in http://railsdojo.wordpress.com/ and normal sites, but slower in www.starcraft2.com
- epiphany 2.19.5-0ubuntu1: same slowdown as firefox

-- 
slow scroll with image in the background
https://bugs.launchpad.net/bugs/125970
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