Comment 14 for bug 67129

I've experienced exactly the same problem. I'd noticed that my computer was running very sluggishly and it felt like a memory issue. CPU usage was normal, yet all of X seemed painfully slow.

After inspecting g-s-m I saw notification-applet was using ~60Megs, which seemed a bit extreme. Further, using this python script to create notifications:
  http://trac.galago-project.org/wiki/PythonNotificationsExample
I was able to arbitrarily increase n-a's memory usage.

After killing n-a, my computer instantly became more responsive and when dbus restarted the daemon, it's memory usage was around 8M.

Is there anything else I can provide to help with this bug?