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I often want to examine the web traffic generated by browsers, and other apps. Sometimes I can use the tools built into browsers, other times proxies, but when I want to take a deeper look and particularly if I’m looking at how a browser is using HTTP/2, I rely on packet captures. One challenge with analysing HTTP/2 traffic is that it’s encrypted and while Chrome and Firefox support logging TLS ke
At BrightonSEO I talked about Third-Party tags, their impact on site-speed, and some of the approaches I encourage my clients to use to reduce this impact. As it’s hard to fit everything into a twenty minute talk, this post expands on the talk and includes some of the points I didn’t have time to cover. From Analytics to Advertising, Reviews to Recommendations, and more, it’s common for sites to r
Many performance techniques focus on improving the performance of the current page, but there are some that help with the performance of the next page – caching, prefetching, and prerendering for example. The Prefetch Resource Hint allows us to tell the browser about resources we expect to be used in the near future, so they can be fetched ready for the next navigation. Several of my clients have
There's been an explosion in 3rd-Party Tags… And as Tim Kadlec once said "Everything should have a value, because everything has a cost". So how do we measure the performance cost of all the 3rd-party tags we keep adding to our sites? Although Chrome supports blocking individual requests, my favourite approach still uses WebPageTest. If you're interested in the Chrome approach Umar covered how to
The pre-loader (also known as the speculative or look-ahead pre-parser) may be the single biggest improvement ever made to browser performance. During their implementation Mozilla reported a 19% improvement in load times, and in a test against the Alexa top 2,000 sites Google found around a 20% improvement. It’s not a new browser feature but some seem to believe it’s Chrome only and yet others sug
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