Yes, it is terribly slow (x86_64 here). I finally decided to download the Thunderbird Beta 4 and just unpacked it in my home directory. Then I copied my .mozilla-thunderbird to .thunderbird. Needless to say, it rocks once again. I also had to download a nightly build of Lightning since I use that too.
** Changed in: thunderbird (Ubuntu) Status: New => Confirmed -- Karmic Beta: Thunderbird&Xorg hog CPU https://bugs.launchpad.net/bugs/448678 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs