Fontawesome speed loading problems I’m using the Bartik Theme on Drupal 8.5 as a base theme (I have the Fontawesome module: 8.x-2.0 installed and I have the fontawesome being loaded from my local files) and I doing a few changes on my custom theme. In one of  the templates I took over, I used  fontawesome with the tag: &lt;i class="far fa-comments"&gt;&lt;/i&gt;.

Sometimes on loading of the pages, before the icon shows, it appear a small square on his place, and only an instant after the icon loads.
I still have the site on debug mode, but is this behavior normal? How can I make the loading of the icons faster?
Scripts are added to the last in the resulting HTML Page in Drupal 8, and External CSS is added in the head, but external CSS is loaded after internal CSS that is used in modules. This might be creating an unwanted delay in rendering your font awesome styles. 

I suggest you minimize the delay of your font awesome script by hosting it on your own server and calling it from there.