Google Fonts Handling / Improvements / PreFetching

[YaWK]

This issue holds all the Google Fonts related Stuff that has to do with handling, improvement or pre-fetching.

About prefetching:
DNS prefetching
A DNS or domain name server converts IP addresses in readable website URLs such as yourwebsite.com. Whenever a user requests an asset being hosted on a particular domain they must perform a DNS lookup and find which domain name that IP address belongs to. This process takes time and the most DNS lookups that are required, the longer your visitors will be waiting for a page to load.

DNS prefetching allows the browser to perform the DNS lookups for links on a page in the background while the user browses the current page. This minimizes latency as when the user clicks on a link with DNS prefetch enabled, they do not have to wait for the DNS lookup to take place as it already has.

DNS prefetch can be added to a specific URL by adding the rel= tag to the link attribute like so:

Similar to link prefetch, DNS prefetch has also been adopted by most modern browsers. As seen on:
https://www.keycdn.com/img/support/browser-support-dns-prefetch-lg@2x.webp

[YaWK]

This needs to be measured. But for now, it's done and will be closed.