I won’t lie. I love (actual love) the
window.performance API. It gives you so much information
about what is happenging on the network for the user that it opens up a huge range of
I have been working on speeding up my site, and one simple thing to do is to add in a
<link rel='dns-prefetch' href='https://somedomain.com'>
and it simply tells the browser to start trying to resolve the domain name ahead of when the browser will try and
fetch the resource. In theory this should reduce the latency for the intial network connection to those domains.
It can be a pain to get that list of domains for prefetching so I wrote this simple script that uses
window.performance to get a list of all the requests made by the page and the domains that they are being
Drag this bookmark to your address bar: Generate DNS prefetch
window.performance API opens a lot of possibilities for automating the possible performance improvements
you can make to your site.