I am also experiencing this bug with TB 17.0 on Linux Mint Debian Edition with an XFCE 4.8 desktop.
What I have found is that CPU usage tends towards 100% on one core when displaying the contents of a message in the Message Pane (use F8 to switch view). When the Message Pane is empty or not visible it does not happen. The behaviour happens both with IMAP and POP3 accounts and both with text and HTML messages. There is no evidence whatsoever that earlier suggested indexing or encryption mechanisms have anything to do with it. Workaround: Do not use the Message Pane. Use F8 to switch it off. I have also reported these findings in the upstream bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=794401 ** Bug watch added: Mozilla Bugzilla #794401 https://bugzilla.mozilla.org/show_bug.cgi?id=794401 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/927515 Title: Thunderbird stuck at 100% CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-consumption/+bug/927515/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
