From 4198fac7390509128c42757fcfb89a0effde4a8e Mon Sep 17 00:00:00 2001
From: Jacob Hoffman-Andrews <github@hoffman-andrews.com>
Date: Tue, 23 Nov 2021 23:00:30 -0800
Subject: [PATCH] Preload the most commonly used fonts.

Don't preload italic font faces because they aren't used on all pages,
and when they are used, they are used sparingly so it's okay if they are
slower to load.
---
 src/librustdoc/html/templates/page.html | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/librustdoc/html/templates/page.html b/src/librustdoc/html/templates/page.html
index 9fafea6914524..3d7232e5d8387 100644
--- a/src/librustdoc/html/templates/page.html
+++ b/src/librustdoc/html/templates/page.html
@@ -7,6 +7,12 @@
     <meta name="description" content="{{page.description}}"> {#- -#}
     <meta name="keywords" content="{{page.keywords}}"> {#- -#}
     <title>{{page.title}}</title> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}SourceSerif4-Regular.ttf.woff2"> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}FiraSans-Regular.woff2"> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}FiraSans-Medium.woff2"> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}SourceCodePro-Regular.ttf.woff2"> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}SourceSerif4-Bold.ttf.woff2"> {#- -#}
+    <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path | safe}}SourceCodePro-Semibold.ttf.woff2"> {#- -#}
     <link rel="stylesheet" type="text/css" {# -#}
           href="{{static_root_path | safe}}normalize{{page.resource_suffix}}.css"> {#- -#}
     <link rel="stylesheet" type="text/css" {# -#}