laravel performance difference just get vs select and get

I have a project(Laravel 5.4) where i need to improve performance as much as i can. So i was wondering what is the performance difference between:

$model->get()

get method takes all variables('created_at','updated_at', etc), so the select should be faster.

$model->select('many variables to select')->get();

select method is an additional query, so it takes more time, so maybe just get is faster?

I wanted to know if select and get is better in all occasions or are there any moments where just get is better?

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