732938 - choppy scrolling on gizmodo.com.au

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[kamulos]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20120304 Firefox/13.0a1
Build ID: 20120304031031

Steps to reproduce:

Browse on gizmodo.com.au, for example in this article http://www.gizmodo.com.au/2012/03/what-will-be-your-next-super-phone-33-hot-phone-specs-compared-updated/ and scroll down to the comments section.


Actual results:

Scrolling got very choppy.


Expected results:

Scrolling should be smooth.

Comment 1

[kamulos]

just found out the reason for this lies inside of <div id="follow"> . giving it the style display:none solves the scrolling performance

Comment 2

[Mayank Bansal]

Here is a profile :

http://people.mozilla.com/~bgirard/cleopatra/#report=783c2a8ca6347d8b2917fc7447964347cf59274f&mergeUnbranched=true&invertCallback=true&selection=%5B%22(total)%22%2C%22mozilla%3A%3Agfx%3A%3ABoxBlurHorizontal%22%5D


I see three possible reasons here

1.the advertisements shown on the page are repainting continuously. Possibly related to :  https://bugzilla.mozilla.org/show_bug.cgi?id=805343   ?

2.boxblurhorizontal : 5.4%
boxblurvertical :     7.5%


3. Jank when the bottom footer images are seen.

Comment 3

[Mayank Bansal]

This is smooth now.