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There’s already a number of sources about HTTP 103 header and it’s impact on page loading time, specificaly to FCP (First Contentful Paint) and LCP (Largest Contentful Paint).

You can take a look at the very technical side of things in this article: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/103, or you can see some early performance gain tests here: https://blog.cloudflare.com/early-hints-performance/.

But we are going to do an ultimate TL;DR; – HTTP 103 Early Hints header and what it does in just two pictures:

This release adds native support for FrankenPHP, currently the most reliable way to send HTTP 103 Early Hints from a WordPress site. If you’re running on a modern stack, this means faster perceived load times with minimal setup.

There’s also initial awareness of Nginx in the setup wizard. While full support isn’t there yet, groundwork is in place for future compatibility.

Why it matters

HTTP 103 Early Hints helps browsers start loading critical resources sooner, directly improving LCP (Largest Contentful Paint) and FCP (First Contentful Paint) — two key Core Web Vitals.

We’re happy to announce that our free WordPress plugin, Easy HTTP 103, has been published on wordpress.org:

If you want to enable HTTP 103 Early Hints on your WordPress website, this plugin makes it simple. It helps your site start loading critical resources earlier, improving perceived performance with minimal setup.

Give it a try and let us know what you think!