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:
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