Rule from network under performance category
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favicon.ico file can cause massive problems on high traffic sites, as the server has to generate a
404 (or other) response for every request.
Some browsers (e.g. Firefox) will keep a list of missing favicons, but not all browsers do. Some servers will even go as far as generating a full 404 page for missing resources.
Having a (cacheable) favicon will prevent this.
Having a favicon also makes your site stand out more in a users bookmarks list.
Generate a small (< 10kb), cacheable favicon for your site.
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