This file is responsible for social and profile icons, the full file size is only 29KB. As it generates font based icons there won’t be any speed issues because of it.
To optimize for fast speed use the following info:
Activate WP Super Cache and Autoptimize plugins and remove all other caching plugins.
After activation enable them by going to their settings and enabling cache checkboxes to enable caching, read their docs if you are new to this. You should have 92-99 pagespeed score just by doing this.
Theme is already pre-tested with these plugins and the live demos use these too. If you can select PHP version at your host then current best performance is with PHP version 7.2