How to run a WebPageTest test
Let's examine the WebPageTest homepage and investigate what all the settings do, including examples of what you can use them for.
All my blog posts: Page 4
Fixing a legacy HTTP/1.1 server configuration with Cloudflare Workers a CDN
It's amazing what a difference a single little response header can have on web performance. Lets 'fix' it at the edge with a <s>Cloudflare Worker</s> CDN.
Using jq with the WebPageTest API
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.
Why you should be testing your 404 pages web performance
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.
A 'Vary' unusual waterfall
Weird things can happen to waterfalls when you don't set the correct response headers.
Measuring and examining TLS 1.3, IPv4, and IPv6 performance
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!
Bringing HTTP/2 to GOV.UK - Resources
A simple blog post bringing all the resources I used and created in the GOV.UK HTTP/2 work.
Example synthetic web performance monitoring dashboards using SpeedCurve
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.
WebPageTest comparison URL generator
The best way to benchmark improvements using WebPageTest is by comparing results. Here's a tool to help you do that.
Improving perceived performance with the CSS `font-display` property
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.