Browser slows down when scrolling on a page with big box-shadow effect

(Needinfo from 2 people)



8 years ago
a year ago


(Reporter: Adeel Ejaz, Unassigned, NeedInfo)


(Blocks: 1 bug)

3.6 Branch
Windows Vista

Firefox Tracking Flags

(Not tracked)




(1 attachment)



8 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv: Gecko/20100611 Firefox/3.6.4 GTB7.1 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv: Gecko/20100611 Firefox/3.6.4 GTB7.1 (.NET CLR 3.5.30729)

The browser slows down and starts jittering when scrolling on a page using mouse wheel with a big box-shadow effect. Other browsers (Chrome, Safari and Opera) behave perfectly.

PS: Using arrows keys gives smooth scrolling

Reproducible: Always

Steps to Reproduce:
1. Scroll up or down the page using mouse feel

Actual Results:  
A bumpy scroll which results in jittering and sometimes even distorting of the page.

Expected Results:  
Smooth scrolling

Comment 1

8 years ago
Just forgot to add.. removing box-shadow does give smoother scrolling.

Comment 2

8 years ago
Created attachment 456948 [details]
test case for Bug 574692

I confirm the existence of this bug on Linux using 3.6.6. The slow scrolling only appears when content is placed under an element with box-shadow set. Furthermore, using the arrow keys to scroll only makes the problem more noticeable for me.

The bug is resolved in v.4 beta 1. If the fix can be ported to the 3.X line, that would be great.

Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100628 Ubuntu/10.04 (lucid) Firefox/3.6.6


7 years ago
Version: unspecified → 3.6 Branch
Blocks: 100951
There is a really similar issue in bug 681226 with latest versions of Firefox.
See Also: → bug 681226
Do you still see this when using current version?

I don't see slowness nor CPU spike using current nightly on win7
Flags: needinfo?(stellariumfan)
Flags: needinfo?(adeel.e)
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