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I have lots of code in models, and although the model might be loaded elsewhere, I like to make sure by doing $this->load->model() almost everywhere its used. Is that all right, or does it use up any resources; even if the model has already been loaded?
The constructor will be executed every time you call $this->load->model(), but the file itself will be loaded only once. It might make sense to put your often-used model into application/config/autoload.php