This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Firefox uses 30-50% cpu on screen off

  • 1 freagra
  • 13 leis an bhfadhb seo
  • 3 views
  • Freagra is déanaí ó guigs

lolnade
lolnade
more options

Using Samsung Galaxy S2 (android 4.4.4) and latest stable Firefox (it also happens with beta). When i am browsing any page and turn the screen off, Firefox constantly uses 30-50% CPU and keeps my device from deep sleep, which results in heavy battery drain and hot device after 20 minutes. Sometimes, Firefox keeps using same % of CPU in background even after I've switched to another app.

Using Samsung Galaxy S2 (android 4.4.4) and latest stable Firefox (it also happens with beta). When i am browsing any page and turn the screen off, Firefox constantly uses 30-50% CPU and keeps my device from deep sleep, which results in heavy battery drain and hot device after 20 minutes. Sometimes, Firefox keeps using same % of CPU in background even after I've switched to another app.

All Replies (1)

guigs
guigs
more options

HI lolnade, Are you on wifi or on Data 2G/3G?

Also the Telementary data sent on the browsers can help improve the performance. There are also automated tests done to check performance of different platforms.

If you are interested in providing a website example this could help create a bug. With the websites, there are have these tools to test the performance of the profile as well: for android local host builds these test can be reproduced here: https://developer.mozilla.org/en-US/d.../Profiling_with_the_Built-in_Profiler#Profiling_Firefox_mobile

There is also DTrace that can help optimize development on javascript pages https://wiki.mozilla.org/Performance/Optimizing_JavaScript_with_DTrace#Ti...

We look forward to your reply!