The reason That I am having two use inside the sub is that I am trying to utilize minimum possible RAM memory, since the moment that you call a module it is loaded in the memory (correct?).

If you require them instead of use them, then the module will only be loaded when you need them.

For example, a number of CPAN module use the following as "front ends" to Carp so Carp is only loaded is needed.

sub _carp
{
    require Carp;
    Carp::carp(@_);
}
sub _croak
{
    require Carp;
    Carp::croak(@_);
}
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