Quick intro into how to collect and read performance profiles with the Gecko profiler addon, and then everybody can profile their own favorite performance problem, and I'll move around and help out. Mike Conley is going to assist me. By December I should hopefully have a new version of the addon + cleopatra ready, so it'll be a good time to demonstrate it, answer questions about it and accept feature requests / bug reports. We want Firefox to be fast, so everybody should be able to quickly find out what's going on when it's not. The Gecko profiler is our number one tool for that.