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dns-prefetch
Here is piece of html head in github pages. Does it use dns-prefetch to optimize page loading speed?
<head>
<meta charset="utf-8">
<link rel="dns-prefetch" href="https://github.githubassets.com">
<link rel="dns-prefetch" href="https://avatars.githubusercontent.com">
<link rel="dns-prefetch" href="https://github-cloud.s3.amazonaws.com">
<link rel="dns-prefetch" href="https://user-images.githubusercontent.com/">
<link rel="preconnect" href="https://github.githubassets.com" crossorigin>
<link rel="preconnect" href="https://avatars.githubusercontent.com">
Frequently visited domains (PROD):
- builder-static.goplus.org
- aigc-static.goplus.org
- cdn.jsdelivr.net
- upload-na0.qiniup.com