Decrease startup time of second
Using Debian Sid/unstable with package gnome-shell 3.27.92-2, and GDM 3.28, trying to display the login screen as quickly as possible, it looks like that GNOME Shell takes over one second to start, which is quite long.
gnome-shell [748]1.656s
Here is an excerpt from the attached log messages.
[…]
Mar 18 15:09:27.738549 xps139370 gnome-shell[748]: JS WARNING: [resource:///org/gnome/shell/ui/slider.js 38]: reference to undefined property "CallyActor"
Mar 18 15:09:27.746917 xps139370 /usr/lib/gdm3/gdm-wayland-session[737]: gnome-session-binary[741]: DEBUG(+): GsmManager: CanShutdown called
Mar 18 15:09:27.746888 xps139370 gnome-session-binary[741]: DEBUG(+): GsmManager: CanShutdown called
Mar 18 15:09:27.761487 xps139370 dbus-daemon[573]: [system] Activating via systemd: service name='org.freedesktop.GeoClue2' unit='geoclue.service' requested by ':1.19' (uid=114 pid=748 comm="/usr/bin/gnome-shell ")
Mar 18 15:09:27.762883 xps139370 systemd[1]: Starting Location Lookup Service...
Mar 18 15:09:27.775147 xps139370 dbus-daemon[573]: [system] Successfully activated service 'org.freedesktop.GeoClue2'
Mar 18 15:09:27.775326 xps139370 systemd[1]: Started Location Lookup Service.
Mar 18 15:09:27.777932 xps139370 polkitd(authority=local)[616]: Registered Authentication Agent for unix-session:c1 (system bus name :1.19 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Mar 18 15:09:27.783078 xps139370 dbus-daemon[573]: [system] Activating via systemd: service name='org.freedesktop.PackageKit' unit='packagekit.service' requested by ':1.19' (uid=114 pid=748 comm="/usr/bin/gnome-shell ")
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