Missing preconnect hints for critical third-party domains
A preconnect hint is a line of code that tells the browser to start connecting to a third-party server (such as a font provider) in the background, before it actually needs anything from it.
Why this matters
Without these hints, the browser waits until it discovers a resource is needed and then begins the connection - adding 100 to 300 milliseconds of delay on mobile, which slows your page load.
How to fix it
Add a link element with rel="preconnect" for each critical third-party domain (such as fonts.googleapis.com) in your page's head section.
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