Suffering from long login times? Here's a little trick that might help. Delete all the records in the Menu Master table - SY07110. When this table has accumulated too many records in it, it not only slows down login, it slows down logout also. I just did this on my personal system and both the login and logout take a fraction of the time they did before.
You don't have to worry about deleting these records because GP recreates the table the next time you log in.