Here is the output from the above script: The following simple shell script was used: To narrow down what is using a lot of CPU, I used oprofile a system wide profiler, with the debugging symbols for Firefox. With a single tab, with no site loaded, Firefox takes 5% of CPU This was installed 18-July-2012 to be specific, and the version is 14.0.1+build1-0ubuntu0.10.04.1.Įver since the upgrade, I am seeing high CPU usage, and it is not related to the number of tabs or windows that are open. However, things changed when I upgrade to Firefox 14 a week ago, again on Ubuntu 10.04. Other than that, Firefox was speedy and responsive. The only issue I faced was excessive disk activity and that was fixed by disabling the FireBug extension. With Firefox 13 running on Ubuntu 10.04, I had good performance, and did not suffer from this problem that I am about to describe.
Ubuntu decided several months ago to forgo its policy of sticking with Firefox 3.6, and go with the latest versions from Mozilla.
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