My 12 Agents/Daemons, load "graciously" behind the scenes, but when I put Mail, Safari, and Music in Autostarter, my CPU is still churning away and blocking progress when I could have already launched some app with a hotkey. Having everything hotkeyed facilitates launching, and, in my instance, actually makes autostarter counterproductive other than for login items that no longer hide.
Did you notice Mail, Safari, and Music have one thing in common? They are all three dependent on internet access and responses from remote servers. Does that suggest a reason they are slow to launch?