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.html518
www.alexrp.co.uk/blog/preloading-fonts.html523
www.alexrp.co.uk/521
www.alexrp.co.uk/blog/resource-hints-prerender.html524
www.alexrp.co.uk/monitor.html524
www.alexrp.co.uk/blog/web-performance-special-cases.html511
www.alexrp.co.uk/blog/fast-single-page-apps.html521
www.alexrp.co.uk/blog/web-performance-black-friday.html522
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html523
www.alexrp.co.uk/about-web-performance.html522
www.alexrp.co.uk/links.html521

First contentful paint

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html689
www.alexrp.co.uk/blog/preloading-fonts.html694
www.alexrp.co.uk/688
www.alexrp.co.uk/blog/resource-hints-prerender.html695
www.alexrp.co.uk/monitor.html695
www.alexrp.co.uk/blog/web-performance-special-cases.html655
www.alexrp.co.uk/blog/fast-single-page-apps.html689
www.alexrp.co.uk/blog/web-performance-black-friday.html694
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html694
www.alexrp.co.uk/about-web-performance.html690
www.alexrp.co.uk/links.html690

DOMContentLoaded

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html841
www.alexrp.co.uk/blog/preloading-fonts.html853
www.alexrp.co.uk/848
www.alexrp.co.uk/blog/resource-hints-prerender.html856
www.alexrp.co.uk/monitor.html854
www.alexrp.co.uk/blog/web-performance-special-cases.html821
www.alexrp.co.uk/blog/fast-single-page-apps.html849
www.alexrp.co.uk/blog/web-performance-black-friday.html852
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html852
www.alexrp.co.uk/about-web-performance.html849
www.alexrp.co.uk/links.html849

Onload

PageMedian (ms)
www.alexrp.co.uk/blog/speed-index-and-ux.html1255
www.alexrp.co.uk/blog/preloading-fonts.html1266
www.alexrp.co.uk/1262
www.alexrp.co.uk/blog/resource-hints-prerender.html1273
www.alexrp.co.uk/monitor.html1270
www.alexrp.co.uk/blog/web-performance-special-cases.html1201
www.alexrp.co.uk/blog/fast-single-page-apps.html1263
www.alexrp.co.uk/blog/web-performance-black-friday.html1264
www.alexrp.co.uk/blog/ab-testing-and-web-performance.html1265
www.alexrp.co.uk/about-web-performance.html1263
www.alexrp.co.uk/links.html1263

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/favicon.ico
Time:1s2s3s4s5s...