Status

()

Core
Layout: View Rendering
4 years ago
3 years ago

People

(Reporter: Vincent Lefevre, Unassigned)

Tracking

26 Branch
x86_64
Linux
Points:
---

Firefox Tracking Flags

(Not tracked)

Details

(Reporter)

Description

4 years ago
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0 (Beta/Release)
Build ID: 20130814030204

Steps to reproduce:

Open https://www.touscoprod.com/


Actual results:

Firefox takes much CPU time (92% on the machine from which I report the bug, with this Firefox version).


Expected results:

CPU usage should remain low, possibly after some time (configurable).

Note: There are scrolling images near the bottom of the page. But CPU usage is almost as high when these images are not visible. If I disable Javascript via about:config, the problem disappears.

Chromium takes about 30% CPU time (but it's also too high).

Comment 1

4 years ago
The images are the problem. If you place your mouse on them, so they stop scrolling, CPU usage goes back to 0%. I think it's a layout problem (and a known one).
If you search Core:Layout for anything related to CPU and scrolling images quite a few come back. It would take a while to figure out which to count as the main bugs and which are duplicates so I'll go ahead and add this to the bunch.
Assignee: general → nobody
Status: UNCONFIRMED → NEW
Component: JavaScript Engine → Layout: View Rendering
Ever confirmed: true
Related bug: probably 693105.
See Also: → bug 693105
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