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We're receiving on all page with wpdiscuz through https://developers.google.com/speed/pagespeed/insights the warning to: Leverage the font-display CSS feature to ensure text is user-visible while webfonts are loading
Based on our research and legit ticket of Font-Awesom, see the last comments of this issue ticket:
https://github.com/FortAwesome/Font-Awesome/issues/14387
You should add in your CSS and so your module:
font-display: block;
in the CSS @font-face{}
To work around this we might be able to disable your import of the font-face Font Awesome through your settings and can add/import Font Awesome in the custom CSS or theme. However I think it's better you update your code with the correct standard of @font-face