keesspoelstra commented on issue #1869: Proposal: link Preconnect for CDN 
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1869#issuecomment-482572566
 
 
   No, preconnect will actually setup a connection to the server, because of 
the SSL/TLS handshake song and dance this is actually a substantial amount of 
time. 
   
   I'm not entirely sure, but in some traces I saw preconnect has priority over 
dns-prefetch.
   

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