I've started one in the background, I'll see what happens in a day or so. This thread: https://github.com/owncloud/client/issues/4985 suggests that maybe owncloud (in my case, the version packaged by Ubuntu) could be what triggers the panel service to leak. I'll leave it closed for a while to see what happens.
** Bug watch added: github.com/owncloud/client/issues #4985 https://github.com/owncloud/client/issues/4985 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1644543 Title: unity-panel-service uses absurd amounts of memory To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1644543/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs