Blog

WebPageTest exposes all its data via an easy to access API, but the data listed can be overwhelming. Using a tool like jq can help. Here's how you use it.

Your may not think it, but your 404 page is an important part of your potential user journey. You should test its web performance as it can have a big impact on your users experience.

Weird things can happen to waterfalls when you don't set the correct response headers.

TLS 1.3 is the new kid on the cryptographic protocols block. It offers better security and better initial connection web performance. And IPv6 is a 'new' internet protocol. Lets examine some shiny new things!

A simple blog post bringing all the resources I used and created in the GOV.UK HTTP/2 work.

Custom dashboards and graphs are a really powerful feature of SpeedCurve. Here's a few examples of how we at GDS are using them for synthetic web performance monitoring.

The best way to benchmark improvements using WebPageTest is by comparing results. Here's a tool to help you do that.

The `font-display` property is a great way to tweak the way your fonts load, especially useful as fonts have a large effect on the perceived performance of your website.

SSL certificate revocation is complex, but absolutely necessary. And your choice of what certificate to use for your site is important, and you should consider its impact on web performance when doing so too.

There's more to WebPageTest than the Waterfall View. In this post I look at the the 'Connection View' and how it can be used to spot web performance issues.

Enabling HTTP/2 doesn't always lead to web performance gains. I believe I may have finally solved a mystery of why performance got worse in some cases.

I don't have any comment functionality on this blog, but I now have Webmentions available. Here's how I did it.