Is it considered bad practice to use jQuery's `.on()` event handler for every event?

Previously, my code contained script like this:

```
$('#cartButton').click(function(){
    openCart();
});

```

However I've recently started using [InstantClick](http://instantclick.io) (a pjax jQuery plugin).

Now none of my scripts work. I understand why this is happening, but I cannot wrap my code with the `InstantClick.on('change', function(){` tag as this means my code starts to repeat itself. For example, clicking on the cart button will run the `openCart()` function many times. So to get around this, I'm changing all my functions to something like this:

```
$(document).on('click', '#cartButton', function(){
    openCart();
});

```

I'm curious as to whether this will increase loading times and cause excess strain. Is it bad practice to use the `on()` event handler for every event in my code?