Firefox CPU usage: Difference between revisions

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=== Hardware acceleration ===
=== Hardware acceleration ===
Disabling cursor and bitmap hardware acceleration on some video cards and drivers can reduce CPU usage when displaying images.[http://forums.mozillazine.org/viewtopic.php?p=2734282#2734282]
Disabling cursor and bitmap hardware acceleration on some video cards and drivers can reduce CPU usage when displaying images.[http://forums.mozillazine.org/viewtopic.php?p=2734282#2734282]
=== Windows prefetch ===
Deleting the Windows prefetch files for Firefox (C:\Windows\Prefetch\FIREFOX*) can prevent problems with the jpeg_fdct_islow thread consuming lots of CPU.[http://forums.mozillazine.org/viewtopic.php?t=184258&start=309]


==Related bug reports==
==Related bug reports==

Revision as of 17:08, 12 August 2007

This article describes how to prevent or work around high CPU usage in Firefox.

Only on specific pages

Plugins

If you're only having problems with sites that use Flash and updating to the latest Flash version doesn't help, you can use the Flashblock extension to selectively enable or disable it [1][2]

If the problem happens when viewing PDF files in the browser, it's likely a problem with the Adobe Reader plugin. One possible fix is to create a "WWW_OpenURL" directory in the "AdobeUM" directory [3]. Another workaround is to disable the browser plugin and so that PDF files open in Adobe Reader as an external application, explained here.

JavaScript

Some sites can cause high CPU usage through extensive use of JavaScript. You can disable JavaScript selectively using the NoScript extension.

Report the site

Report the site using Help -> Report Broken Web Site. Reporting the problem will help identify sites with problems so Mozilla evangelists can help fix their problems, and also help Mozilla developers track down any bugs in Firefox that could be causing excessive CPU usage.

All the time

Extensions

Problematic extensions can cause excessive CPU usage.

Windows Compatibility mode

Firefox can cause excessive CPU usage if it's set to run in compatibility mode for an older version of Windows.[4] To fix the problem, right-click on the Firefox icon you click to start Firefox, click Properties, click the Compatibility tab, make sure the check box under Compatibility mode is unchecked, and restart Firefox.

Hardware acceleration

Disabling cursor and bitmap hardware acceleration on some video cards and drivers can reduce CPU usage when displaying images.[5]

Windows prefetch

Deleting the Windows prefetch files for Firefox (C:\Windows\Prefetch\FIREFOX*) can prevent problems with the jpeg_fdct_islow thread consuming lots of CPU.[6]

Related bug reports

See also