Page causes high CPU load




4 years ago
3 years ago


(Reporter: Martin Stolpe, Unassigned)


30 Branch
Windows 7

Firefox Tracking Flags

(Not tracked)




4 years ago
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release)
Build ID: 20140605174243

Steps to reproduce:

This page causes high CPU load on my system:

If I open this site CPU usage will rise to ~20% on Core i7 2620M. Internet Explorer 11 and Chrome 35 are able to handle the website with ~5% CPU usage so I think there might be something wrong in Firefox.

Comment 1

4 years ago
CPU usage is better in Firefox 31 but still 6% higher than in Chrome.

Comment 2

3 years ago
Hello Martin, thank you for reporting this issue and extremely sorry for contacting you so late. We are in the process of bug triaging and wanted to touch base you regarding this defect. I tried to test the behavior on a Windows 7 64 bit machine using the latest version of Firefox 43.0.4 and compared the CPU usage with chrome after navigating to the URL that you specified. I used permon to monitor the CPU usage over a period of about 1 min 30 seconds in both the cases with just 1 tab open in Firefox and Chrome. After their steady state (opening of their instance), I observed that average CPU usage just went up by 2%-3% on both the browsers over this 90 seconds of time. I tested on:

Name 	Firefox
Version 	43.0.4
Build ID 	20160105164030
Update Channel 	release
User Agent 	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0

If you have not done so, may I request you to upgrade your Firefox to the latest version and let us know if you still encounter the same issue of high CPU usage with respect to other browsers like Chrome. I would request you to monitor the usage over some period of time and then compare the averages over that time.
Component: Untriaged → General
Flags: needinfo?(martin.stolpe)

Comment 3

3 years ago
I think this can be closed. I don't see this behavior anymore.
Last Resolved: 3 years ago
Flags: needinfo?(martin.stolpe)
Resolution: --- → WORKSFORME
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