541385 - Slow scrolling when page is scaled and repeated tall background gif

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Adil Allawi]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.3a1pre) Gecko/20100119 Minefield/3.7a1pre
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.3a1pre) Gecko/20100119 Minefield/3.7a1pre

When I browse the given URL and scale the page to anything other than 100% (e.g. by pinch-zoom on a MacBook trackpad) scrolling is slow and jerky. On further investigation, the slow scroll is caused by a tall and narrow gif (4x1321 pixels) as a css background image to the body tag. When I remove the background gif using firebug, scrolling is normal again.

Reproducible: Always

Steps to Reproduce:
1. go to jayisgames.com
2. scale the view of the page (e.g. pinch zoom on a MacBook trackpad)
3. scroll using mouse wheel or scrollbar
Actual Results:  
Scrolling is jerky

Expected Results:  
Scrolling is smooth

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

all 1.9.x releases are affected. 1.8.x support only text-only zoom what does not make the scrolling suck. text only zoom is fine on 1.9.x too.

Comment 2

[Alex Riesen]

Me too. 3.6.4b1. Example url:

  http://www.enterprisenetworkingplanet.com/news/article.php/3878391

has a 1x2900 background gif image.

Comment 3

[Marco Castelluccio [:marco]]

I think this isn't an issue with latest versions of Firefox. Could someone test the URLs so that we can close as WORKSFORME?

Comment 4

[Alex Riesen]

Can't reproduce either. Looks like it is fixed.

The site doesn't use such a background anymore, so I just made a page with an image in background as big as it was on that site.