Diagnosing slow session startup

[Tim Cuthbertson <tim gfxmonk net>]

Hi all,

I'm not sure that this quite belongs here, but my gnome session
(running gnome-shell on fedora 17) takes upwards of 45 seconds before
the top panel appears after logging in. Does anyone know how I can
diagnose what might be taking so long? Ideally I'd like something like
systemd's bootchart (but for session login), but maybe there are some
gnome-shell or gnome-session diagnostics I can turn on to get some
logging?

Cheers,
 - Tim.