Speed of SQL Authenication vs. Trusted Connection

Why would SQL Authenication be slower than Trusted Connection?

Could the person who coded it done somthing to prefer trusted and when
it fails to use sql authenication and thus slow it down.

The same front-end using sql authenication is 1/20th the speed of when
it is switched to Trusted connection.

We do not use domain servers since we use Novell for network storage so
we really want to find out why sql authenication is so slow as it will
not work with 60+gig db of database.

Thanks

.