If You want to speed up your page Then the DNS prefetch link will play a key role.
DNS-prefetch link
is an try to resolve domain names before resources get requested.
For SEO Point of view What is DNS Prefetch will help because page speed will be increased because of its resolves domain name before request the data.
Answer :
The main purpose for rel=dns-prefetch or DNS Prefetch to speed up the way web pages load when they are using different domains or cross-domain for page resources or data.
Of course, DNS preacher will improve SEO because of the speed up page with resolving the cross-domain problems if try to access cross-domain.
rel="dns-prefetch" href="https://www.worldgyan.com"> |
rel="dns-prefetch" href="https://stackpath.bootstrapcdn.com"> |
rel="dns-prefetch" href="https://www.worldgyan.com/css/"> |
rel="dns-prefetch" href="https://www.facebook.com"> |
rel="dns-prefetch" href="https://www.worldgyan.com/wg"> |
rel="dns-prefetch" href="https://ajax.googleapis.com"> |
Its depend on from where resource are loading