After boot .take long time to start GDM

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http://forums.fedoraforum.org – I use last Gnome and I use GDM ,after boot system , it take long time to start GDM and after 10 sec or more GDM start and I can login and use my system, before start GDM ,for 10 sec or more ,I see gray page or picture and after that GDM start (HowTos)