Slow down/Crazy Memory comsumption with some sites

Discussion of bugs in Mozilla Firefox
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Joined: June 17th, 2014, 5:26 am

Post Posted June 17th, 2014, 5:45 am


I noticed, starting from the build 29, a strange behavior while browsing some sites. For example,
Firefox will start to allocate and release memory in loops and the user interface becomes very unresponsive.

Some screenshots (Ubuntu x64, Firefox 30.0). Also happens on Windows.

While loading the site

After closing TAB
Last edited by James on June 17th, 2014, 7:07 pm, edited 2 times in total.
Reason: Large image/s reduced to preserve the forum layout. edit2 by James: made them as thumbnail links to full 1,600px × 900px size instead of links.


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Post Posted June 17th, 2014, 6:08 pm

1. Does it happen only on websites that are trying to load videos as that one appears to be doing?

2. Does it happen in Firefox Safe Mode? Press Alt to get to the Menu > Help > Restart with Addons Disabled. Do not choose the Reset option.
Tip of the day: If it has "toolbar" in the name, it's crap.
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Joined: June 17th, 2014, 5:26 am

Post Posted June 18th, 2014, 4:20 am

Hi patrickjdempsey,

it seems that these websites are using JavaScript. It does happen in safe mode, yes.

I've collected two profile traces that should help. Profile1.json one was collected while loading Profile2.json while loading

What seems to be taking a long time is the method Paint::PresShell::Paint.

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Post Posted June 18th, 2014, 12:13 pm

I also am experiencing the same issue with a few websites; not all

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Location: Atlanta

Post Posted June 20th, 2014, 12:18 pm

Me too, memory use & CPU use jump way up... And it's nearly impossible for me to watch videos, especially on Netflix & Facebook!
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Post Posted June 21st, 2014, 7:11 am

That ("little" Flash) ad at the top of the page (by the FlatOut! logo), is quite expensive (CPU-wise).

FlashBlock or NoScript to block the Flash, or Adblock Plus to block the ad.
Fire 750, bring back 250.
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14 Pinball CopyURL+ FetchTextURL FlashGot NoScript

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