756964 - CSS animations of background-color on prefixfree homepage make Firefox 13 use 100% CPU

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Michał Gołębiowski-Owczarek [:mgol]]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0
Build ID: 20120517221321

Steps to reproduce:

I visited the -prefix-free webpage:
http://leaverou.github.com/prefixfree/

I did it both with my primary Firefox profile and with a separate one run in -safe-mode with every defaulting option turned on.


Actual results:

The -prefix-free webpage:
http://leaverou.github.com/prefixfree/
makes the newest Firefox 13 beta on Ubuntu 12.04 64-bit use 100% CPU.


Expected results:

It should not use so much CPU.

Comment 1

[Michał Gołębiowski-Owczarek [:mgol]]

I don't have a stable Firefox 12 here but I've checked on a separate profile with Firefox 3.6 (yeah, I know) and the problem's not happening so it has to be sth in between.

Comment 2

[Michał Gołębiowski-Owczarek [:mgol]]

Both Opera 12 beta and Chrome 19 (stable) don't exhibit the problem so it must be Firefox-related.

Comment 3

[Michał Gołębiowski-Owczarek [:mgol]]

It also makes Firefox crash very often, 3 latest submitted crash IDs are:
2012-05-21 08:56 bp-1a31bf78-7848-4213-a56f-0862e2120521
2012-05-21 08:56 bp-d7eca0e3-3c72-42ff-9eed-9e8d12120521
2012-05-21 08:57 bp-3879754c-a9c1-44e9-97ec-939e42120521

Comment 4

[Michał Gołębiowski-Owczarek [:mgol]]

Losing tab focus seems to help... I get this CPU usage increase mainly when activating the tab (it remains high over the time, though).

Comment 5

[Michał Gołębiowski-Owczarek [:mgol]]

Minimal example (the prefix-free page with as many elements cut out as possible):
mgol.eu/prefixfree_asdgfsaldgsdkfgsdkfgjsdfghsdlkfg
Also, note that high CPU usage happens almost only when the tab is active.

Comment 6

[Michał Gołębiowski-Owczarek [:mgol]]

OK, in Firefox 3.6 and Chrome the issue doesn't exist because they don't support the property used. However, Opera 12 does and it does it way more efficiently than Firefox 13 (and doesn't crash in the process).

Comment 7

[Ahmad Saleem]

I am unable to reproduce it with Firefox Nightly 15. I suggest you to try New Profile or Safe Mode and reproduce it.

Comment 8

[Michał Gołębiowski-Owczarek [:mgol]]

I've already tried it with a new profile in safe mode and I wrote about it in my first comment...

Comment 9

[Michał Gołębiowski-Owczarek [:mgol]]

Most of the CPU usage spike is caused my -moz-animation. Crashes might be a different issue, though...

Comment 10

[Michał Gołębiowski-Owczarek [:mgol]]

I created a completely new profile and opened the prefix free page a couple of times. It doesn't crash consistently but it happened a few times. One of reports from this new profile is:
2012-05-21 10:33 bp-1609cebf-6eff-4b77-942c-8e38f2120521

Comment 11

[Virgil Dicu [:virgil] [QA]]

Could you also reproduce this in the latest Firefox Nightly?

I can't reproduce this either with Ubuntu 12.04 i686. tried with the latest Nightly.

Are you using builds from Mozilla (e.g. mozilla.org)  or builds that come with your distribution?

Comment 12

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Crashes and high CPU usage belong in different bugs.  Based on the summary, this bug should be about the high CPU usage and the crashes belong in a separate bug.  (However, the crash reports don't have much information in them; they don't look like reports we'd get from a build that we shipped.)

Comment 13

[Michał Gołębiowski-Owczarek [:mgol]]

I'm using Firefox from this repository:
https://launchpad.net/~mozillateam/+archive/firefox-next
This repo is maintained by Ubuntu Mozilla Team, the same one that packages official stable builds.

However, I downloaded your 13.0b4 build and the issue (both, actually) still stands.

Comment 14

[Michał Gołębiowski-Owczarek [:mgol]]

I created a separate bug report for crashes:
https://bugzilla.mozilla.org/show_bug.cgi?id=757108

Comment 15

[Alice0775 White]

Attachment: reduced html

Comment 16

[Michał Gołębiowski-Owczarek [:mgol]]

And again, disabling (e.g. via Firebug) the -moz-animation parameter from the attachment 626051 [details] fixes the issue.

Can it be sth related to poor graphics drivers? I experience it on Ubuntu 12.04 64-bit with Inter GMA 4500MHD on board.

Comment 17

[Michał Gołębiowski-Owczarek [:mgol]]

Another person has confirmed the issue here:
https://github.com/LeaVerou/prefixfree/issues/72#issuecomment-6568279

Comment 18

[JKL]

I can confirm the issue using the reduced test case attached. I'm running the 16.0a1 (2012-07-16) nightly in safe mode on Ubuntu.

CPU usage is around 100%, and approximately evenly distributed between compiz, Xorg, and RunProcess.

For graphics, I have NVIDIA GeForce GTX 260M/PCIe/SSE2 -- 3.3.0 NVIDIA 295.40

I can also confirm that this issue affects the 1.10 version of firebug. They added some more background animation associated with the Break On Next feature, and when the firebug panel is open it uses quite a lot of CPU.

http://code.google.com/p/fbug/issues/detail?id=5618

Comment 19

[Sebastian Zartner [:sebo]]

Using Firefox 34.0 on Windows 7 I can't reproduce this huge CPU workload.

Michał, is this still a problem?

Sebastian

Comment 20

[Michał Gołębiowski-Owczarek [:mgol]]

Attachment: reduced-case.html

Updated case with -moz- prefixes removed.

Comment 21

[Michał Gołębiowski-Owczarek [:mgol]]

I can't reproduce it anymore but:

1. I no longer have access to the computer on which I've experienced the bug.
2. I use OS X now so I cannot re-test on Linux.

Perhaps it'd be best if someone with a Linux machince could re-test. Otherwise, it seems good to close.

Comment 22

[Michał Gołębiowski-Owczarek [:mgol]]

Attachment: reduced-case.html

Adds a -webkit- prefix to be able to cross-test with Chrome/Safari

Comment 23

[Michał Gołębiowski-Owczarek [:mgol]]

I think I'll just close it. :)