825561 - Over invalidation on page causes janks and high CPU usage

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Mayank Bansal]

Attachment: complete web page

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20121230 Firefox/20.0
Build ID: 20121230030830

Steps to reproduce:

1. Create a fresh profile
2. Enable debug paint flashing
3. Go to http://onlyssd.com/ssd-brand/buy-crucial-ssd
4. Click anywhere on the page.    Snow will start dropping from the sky.



Actual results:

1.Each snow particle causes huge invalidations.
2.If possible, check CPU usage. It uses 100% of one core.
3. Try scrolling. Full page invalidation.


Expected results:

Less CPU usage. less invalidation. More page responsivity.


*************************************************
Attaching the complete page HTML.
This page is somewhat similar to the "IE10 bubbles demo".

Comment 1

[Mayank Bansal]

Also, FWIW, the falling snowflakes fall faster in FF15, Opera12.12 and IE10RC, as compared to the latest Nightly.

Comment 2

[Mayank Bansal]

The page seems to have removed the offending script, so to reproduce, see the attached complete webpage.

Comment 3

[Mayank Bansal]

Only the individual snow particles repaint now. And the heading in the top also repaints a lot.
The rest of the page doesnt repaint. However, the CPU use is still 100%

Comment 4

[Wayne Mery (:wsmwk)]

testcase URL fails http://www.onlyssd.com/ssd-brand/buy-crucial-ssd

Comment 5

[Mayank Bansal]

I have attached the complete webpage as an attachment here.  The snowflakes will take 10-12 seconds to appear, and are not clearly visible. But they do affect the performnace.
  
On the latest nightly with a fresh profile, this page still causes heavy janks while scrolling, and opening menus etc.
I could not verify whether there is overinvalidation or not.

I am tentatively reopening this bug. Please do check the attached webpage.  If you dont find anything actionable, feel free to close this.

Comment 6

[Wayne Mery (:wsmwk)]

I never see the snowflakes, and performance in IE and chrome are far worse.

Does it reproduce for you in safe mode?

Comment 7

[Mayank Bansal]

If you see debug paint flashing from the dev toolbar, you will see the snowflakes on the screen.

The invalidation problem is much better now. Each snowflake repaints only a very minimal amount.  However, the page is laggy in scrolling, and the menus take a long time to appear.

The problem is better in safe mode. So probably a gfx issue?

Comment 8

[Mikel]

404 page not found :/

Comment 9

[Mayank Bansal]

cant repro anymore.