'link rel=icon' and 'link rel=shortcut icon' at the same time

Hi,

I've seen a website with the following headers to show the favicon

<link rel="icon" href="https://theserver/images/myfavicon.ico" type="image/png" />
<link rel="shortcut icon" href="https://theserver/images/myfavicon.ico" type="image/png" />

I wondered if this method, inserting both 'link rel=icon' and 'link rel=shortcut icon', is a good practice for SEO. Doesn't waste too much resources?

Thank you.