1271142 - high cpu opening site

Status: RESOLVED DUPLICATE of bug 1250947

(Core :: Graphics, defect)

Description

[Manuel Azevedo]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:46.0) Gecko/20100101 Firefox/46.0
Build ID: 20160502172042

Steps to reproduce:

When opening this site:
http://docs.pixelmatix.com



Actual results:

The browser becomes very slow and almost unresponsive. 
The CPU utilization of Firefox is always 100% in MacOS X and almost 95% in Windows 10.


Expected results:

Opening the same site with Safari or Edge yields no problem, site open fast and is very responsive.
In previous versions (I cannot precise which) the site opened normally.

Comment 1

[Michelle Funches - QA]

Are you still experiencing this issue?
I cannot reproduce 46.0.1
Build ID 20160502172042 - Mac OS X 10.11
Build ID 	20160502172042
User Agent 	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0

Comment 2

[Manuel Azevedo]

Attachment: Performance accessment while opening the site

I disabled all add-ons and plugins. Still get the same behaviour. Version 46.0.1

Comment 3

[Manuel Azevedo]

Hi Michelle,
Still have the same issue - disabled all add-ons and plugins. Performance assessment attached in previous post. Cannot see any significant network delays. Page movement is all jerky and beach-ball cursor appears. Have to wait for Firefox to become responsive and close the tab or simply kill Firefox and start over.
I'll keep doing more tests, but so far, I can reproduce all the time.

Comment 4

[Manuel Azevedo]

Made a new account on my computer. Logged in into new account. First time opening the page, it loads normally. When clicking on one of the links, Firefox slows down, freezes and the beach-ball comes again. CPU at 100%. Closing Firefox and opening the site again, already freezes Firefox. Looks like something gets cached (either data or a cookie) and on next load it automatically causes the CPU to spike.

Comment 5

[Michelle Funches - QA]

Manuel: Have you tried the Refresh Firefox option that can be accessed from this link below or the about:support page

https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings 

Also thanks for the updates. I have finally reproduced. I did receive Buffer Full messaging and beach ball cursor on Mac 10.11; but still not as consistent for me. 

Cache: Can you help investigate; if wrong group, please move and I will make note for future, thanks.

Comment 6

[Manuel Azevedo]

Hello Michelle:
I've found something that might help. I'm using a Retina 27" iMac - my normal window size is about 4880x2640 pixels - if I resize the window to a smaller size, the CPU utilization goes down - hence why it might have different behaviour on your computer. Likewise, when using the Windows Firefox version I was also running on a VM on this computer, again with big resolutions.
I remember on older versions of opening this site on this computer and resolution and not having the problem. I cannot precise however which last version opened it correctly.

Comment 7

[Manuel Azevedo]

Forgot to include: Refresh Firefox had the same behaviour - still freezes after opening the webpage.

Comment 8

[Michelle Funches - QA]

I am getting a little more consistency with this. Will this help?

Warning: Unresponsive script
Script: resource://gre/modules/commonj...dules/logic/waterfall-utils.js:121

Comment 9

[Honza Bambas (:mayhemer)]

This is not an HTTP cache issue.  Please retriage the component, thanks.

Comment 10

[Mike Conley (:mconley) (:⚙️)]

I think I was able to reproduce, and gathered a profile:

https://cleopatra.io/#report=3e6a458d6cf11bcfb7b1d5967158115afc80a087&selection=0,1,2,52,57,58,59,68,737,61,69,927

There's a big slowdown when drawing box shadows. I think this is a painting / graphics issue.

Comment 11

[Mason Chang [Inactive] [:mchang]]

Thanks for profiling Mike! This might be fixed in nightly where we did a lot of rework for inset box shadows. Can you try nightly please? https://nightly.mozilla.org/

Comment 12

[Manuel Azevedo]

Hello Chang. I confirm in the current nightly the site appears to perform much better.