I have the same problem on 12.04 with Thunderbird 16.0.1. After starting, CPU spikes up to ~60% and stays there for around 20 minutes.
Switching to offline mode immediately stops the problem, switching it back on resumes it, so yes, it is probably email syncing or something related. There is a good amount of emails in my TB (around 10k unread, and probably 50k read) and my .thunderbird folder is around 3GB of size, but I don't think this justifies what happens - probably it is a bug. I have attached my strace log (no gettimeofday calls btw); watch out, it blows up to 70MB when uncompressed. This problem is highly annoying and drains my CPU quickly. Do we have an upstream bug for this? ** Attachment added: "thunderbird strace during high CPU on email sync" https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/927515/+attachment/3405629/+files/thunderbird.strace.xz -- 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 uses excessive cpu power To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/927515/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
