Sort load of login items
Modern OS X installations start the items simultaneously, independent of their visible order, and also use additional mechanisms such as Resume and invisible launch entries which have influence on the start sequence during the login phase.


From: http://www.bresink.com/osx/0TinkerTool/history.html

See:


How do I change the order in which login items execute under OS X 10.8.2?
How to control order of startup items for users at login?