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[N Massart <845592@xxxxxxxxxxxxxxxxxx>]

More tests showed me that this is not when switching tab that the problem happens but when trying to use the History menu commands.
I tried launching FX in safe mode, no tabs open except the main one with Google search page, and as I click on the history menu, FX starts to use 100% CPU for about 1 minute.

So I emptied my history and all works nice.
I used firefox sync to retrieve all my history, prefs and passwords from home to this new PC. I never had this problem even on my EEEPC. here it's a Dell optiplex 360 with 4Go RAM and 2 cores CPU, I should not freeze if an EEEPC doesn't...

Any perfs issue between ubuntu and FX ?

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https://bugs.launchpad.net/bugs/845592

Title:
  Firefox 6.0.2 process rises to 100% of CPU use when switching tab

Status in “firefox” package in Ubuntu:
  New

Bug description:
  Firefox process rises to 100% CPU usage sometimes when switching from one tab to another even if the pages loadings are finished. But this is not happening at any tab switching.
  I tried disabling any extensions and plugins (so Flash is not in cause this time), but the same overload happens.
  After a few minutes (2 or 3 max), the process CPU load comes back to normal... until next time.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  Architecture: amd64
  Date: Fri Sep  9 14:55:16 2011
  FirefoxPackages:
   firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
   flashplugin-installer 10.3.183.7ubuntu0.11.04.1
   adobe-flashplugin N/A
   icedtea-plugin 1.1.1-0ubuntu1~11.04.1
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcEnviron:
   LANGUAGE=fr_FR:en
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)

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