How this site performs

This page contains web performance stats 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.html475
www.alexrp.co.uk/blog/preloading-fonts.html476
www.alexrp.co.uk/476
www.alexrp.co.uk/blog/resource-hints-prerender.html475
www.alexrp.co.uk/monitor.html476
www.alexrp.co.uk/blog/web-performance-special-cases.html475
www.alexrp.co.uk/blog/fast-single-page-apps.html476
www.alexrp.co.uk/blog/web-performance-black-friday.html476
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html475
www.alexrp.co.uk/about-web-performance.html476
www.alexrp.co.uk/links.html475

First contentful paint

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html613
www.alexrp.co.uk/blog/preloading-fonts.html622
www.alexrp.co.uk/617
www.alexrp.co.uk/blog/resource-hints-prerender.html613
www.alexrp.co.uk/monitor.html617
www.alexrp.co.uk/blog/web-performance-special-cases.html613
www.alexrp.co.uk/blog/fast-single-page-apps.html613
www.alexrp.co.uk/blog/web-performance-black-friday.html613
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html613
www.alexrp.co.uk/about-web-performance.html616
www.alexrp.co.uk/links.html616

DOMContentLoaded

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html753
www.alexrp.co.uk/blog/preloading-fonts.html757
www.alexrp.co.uk/754
www.alexrp.co.uk/blog/resource-hints-prerender.html752
www.alexrp.co.uk/monitor.html753
www.alexrp.co.uk/blog/web-performance-special-cases.html753
www.alexrp.co.uk/blog/fast-single-page-apps.html756
www.alexrp.co.uk/blog/web-performance-black-friday.html753
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html751
www.alexrp.co.uk/about-web-performance.html753
www.alexrp.co.uk/links.html751

Onload

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html1081
www.alexrp.co.uk/blog/preloading-fonts.html1086
www.alexrp.co.uk/1082
www.alexrp.co.uk/blog/resource-hints-prerender.html1082
www.alexrp.co.uk/monitor.html1082
www.alexrp.co.uk/blog/web-performance-special-cases.html1082
www.alexrp.co.uk/blog/fast-single-page-apps.html1085
www.alexrp.co.uk/blog/web-performance-black-friday.html1082
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html1081
www.alexrp.co.uk/about-web-performance.html1082
www.alexrp.co.uk/links.html1081

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/blog/preloading-fonts.html?utm_source=ponyfoo+weekly&utm_medium...
www.googletagmanager.com/gtag/js?id=UA-148024686-1 No visible bars indicates retrieved from cache
www.alexrp.co.uk/css/common-v2.css
www.alexrp.co.uk/images/img-ahead-of-font.png
www.alexrp.co.uk/images/preload-930.png
www.alexrp.co.uk/images/font-film.png
platform.linkedin.com/in.js No visible bars indicates retrieved from cache
platform.twitter.com/widgets.js No visible bars indicates retrieved from cache
www.alexrp.co.uk/images/feed-icon-28x28.png
www.alexrp.co.uk/images/devtools-preload-860.png
www.alexrp.co.uk/images/devtools-no-preload-860.png
www.alexrp.co.uk/images/banner-2560.jpg
www.alexrp.co.uk/fonts/fontos.woff2
Time:1s2s3s4s5s...