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DNS Prefetching: Loading the DNS of the domains needed before they are required
01-24-2013, 05:54 AM
Post: #2
RE: DNS Prefetching: Loading the DNS of the domains needed before they are required
If you can you need to cut down the number of domains even if the browser prefetches the DNS for them all then you're still going to have the delay of making the TCP connection and waiting for the TCP window to open wide enough (though some sites will start with a window wide enough for 15KB)

Add 15 prefetch directives will add 2KB (ish) to the page, it's got lots of repeated patterns so should compress well with to gzip.

Perhaps a way to start is to prefetch the DNS for those domains that are needed for page-render to happen and monitor the change in performance, then test whether it's worth adding any more.

Andy

Using WebPageTest - http://usingwpt.com/
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RE: DNS Prefetching: Loading the DNS of the domains needed before they are required - andydavies - 01-24-2013 05:54 AM

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