how could i store an object inside Ticket UserData property

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ASP.NET

security

Hello All

how could i store user data as object inside Ticket UserData

i have a class which is SSUser , this class authenticate and load all permissions of current user in the login page
as this

SSUser myUser=Authenticate("username","password");

Authenticate method return an object of SSUser when the username and password is correct
now what i am doing is saving this "myUser" in the Session state like this

Session.Add("User",myUser);

there is no problem with that , but i have read that storing object inside Session state lead to low performance when the application is used by more that 10 users at the same time.
my question
is could i store this "myUser" object inside the Ticket.UserData ??
is there any solution for that ?

thank you very much