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When a browser loads a Notify page it does the following: - DNS and TLS handshake for notifications.service.gov.uk - download some HTML - sees that the HTML needs to load some CSS - DNS and TLS handshake for static.notifications.service.gov.uk - downloads the CSS We can speed things up a bit in modern browsers by parallelizing this process a bit. Modern browsers support some HTTP headers[1] that allow them to connect to other origins sooner. After this change the steps are: - DNS and TLS handshake for notifications.service.gov.uk - receive response headers and simultaneously: - download some HTML - DNS and TLS handshake for static.notifications.service.gov.uk - sees that the HTML needs to load some CSS - downloads the CSS 1. https://developer.mozilla.org/en-US/docs/Web/Performance/dns-prefetch