A web performance blog

by Alex Painter

Web performance stats

This page contains web performance data for this website. It's taken from real user monitoring, which I've added using Boomerang.

Real user monitoring works by sending a beacon containing performance data for every visit to a page on the site. This makes it a good way to gain insights into the experience a website delivers.

Not every test reports on every metric – for example, some browsers don't support first contentful paint.

I've just picked out a few metrics to highlight on this page.

Response start

When the first byte of data is delivered to the browser.

First contentful paint

This aims to measure the point at which people can begin to consume content on the page.

DOMContentLoaded

The DOM and CSSOM are likely to be ready at this point. DOMContentLoaded can be important because some scripts will wait for this event before executing.

Onload

The time it takes for all the resources on the page to finish loading – although this excludes script-injected assets that are fetched only when the onload event has fired.

Response start

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html422
www.alexrp.co.uk/blog/preloading-fonts.html605
www.alexrp.co.uk/603
www.alexrp.co.uk/blog/resource-hints-prerender.html604
www.alexrp.co.uk/monitor.html534
www.alexrp.co.uk/blog/web-performance-special-cases.html609

First contentful paint

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html376
www.alexrp.co.uk/blog/preloading-fonts.html569
www.alexrp.co.uk/562
www.alexrp.co.uk/blog/resource-hints-prerender.html566
www.alexrp.co.uk/monitor.html467
www.alexrp.co.uk/blog/web-performance-special-cases.html569

DOMContentLoaded

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html764
www.alexrp.co.uk/blog/preloading-fonts.html1044
www.alexrp.co.uk/1042
www.alexrp.co.uk/blog/resource-hints-prerender.html1042
www.alexrp.co.uk/monitor.html943
www.alexrp.co.uk/blog/web-performance-special-cases.html1044

Onload

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html1120
www.alexrp.co.uk/blog/preloading-fonts.html1525
www.alexrp.co.uk/1517
www.alexrp.co.uk/blog/resource-hints-prerender.html1518
www.alexrp.co.uk/monitor.html1372
www.alexrp.co.uk/blog/web-performance-special-cases.html1518

Resource timings for latest test

The following waterfall chart is taken from the most recent test (excluding tests of this page) and gives an indication of how long it took to load the resources on that page.

www.alexrp.co.uk/
www.alexrp.co.uk/fonts/contrailone.woff2 No visible bars indicates retrieved from cache
www.googletagmanager.com/gtag/js?id=UA-148024686-1
www.alexrp.co.uk/images/alex400.jpg Short bars indicate retrieved from cache
www.alexrp.co.uk/images/Twitter_Social_Icon_Rounded_Square_Color.svg
www.alexrp.co.uk/images/linkedin.png Short bars indicate retrieved from cache
www.google-analytics.com/analytics.js Short bars indicate retrieved from cache
www.google-analytics.com/r/collect?v=1&_v=j79&a=1694699419&t=pageview&_s=1&dl=ht...
Time:1s2s3s4s5s...