Performance

https://web.dev/preload-scanner/

https://web.dev/reduce-javascript-payloads-with-code-splitting/ → Dynamic imports

<link rel="preconnect" href="https://example.com" />

https://web.dev/preconnect-and-dns-prefetch/

Knowing where from, but not what you're fetching

https://css-tricks.com/using-relpreconnect-to-establish-network-connections-early-and-increase-performance/

https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/