Google Font Preconnect
Next.js automatically adds
<link rel="preconnect" />after version12.0.1.
Ensure
preconnectis used with Google Fonts.
Why This Error Occurred​
A preconnect resource hint was not used with a request to the Google Fonts domain. Adding preconnect is recommended to initiate an early connection to the origin.
Possible Ways to Fix It​
Add rel="preconnect" to the Google Font domain <link> tag:
<link rel="preconnect" href="https://fonts.gstatic.com" />
Note: a separate link with dns-prefetch can be used as a fallback for browsers that don't support preconnect although this is not required.