You are right, adding font-awesome or any third-party icon CDN is a big performance issue.
Why are you changing the icons from a third-party service? This reduces website performance, security and privacy.
The module doesn't require a lot of icons, you have to put them locally. I suggest you use free SVG icons, available on Bootstrap :
https://icons.getbootstrap.com/
Thank you, integrate SVG directly into the module and do not use third-party services.
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You are right, adding font-awesome or any third-party icon CDN is a big performance issue.