Are you also experiencing Bug #1456326 ? Maybe this could be related and
caused by the X-Server.
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https://bugs.launchpad.net/bugs/477917
Title:
bogged down menu applications and scrolli
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: firefox-3.5 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/477917
Title:
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/35336646/Dependencies.txt
** Attachment added: "profile_default_pluginreg.dat.txt"
http://launchpadlibrarian.net/35336647/profile_default_pluginreg.dat.txt
** Attachment added: "profiles.ini.txt"
http://launchpadlibra