Split library into 2 versions, 'light' and 'complete', then call functions from either using just 1 library name.

[eluser]wh1tel1te[/eluser]

Code:

$this->load->library('my_light_library', '', 'my_lib');

or:

Code:

$this->load->library('my_complete_library', '', 'my_lib');

then:

Code:

$this->my_lib->some_function();

More info here.