You may have noticed something called "mediawiki-fresnel" leaving messages on Gerrit patches for MediaWiki in the past few days, and wondering what it's all about. Allow me to introduce Fresnel!

Fresnel is an automation tool for measuring and comparing client-side performance from web pages. Fresnel was developed over the past two quarters and is now ready for action. [1] [2] [3]

To learn more about how to use it, what it offers, and how it works, check out: https://wikitech.wikimedia.org/wiki/Performance/Fresnel

Some feature highlights:

- ⏱ *Metrics* from Navigation Timing, Paint Timing, and Resource Timing APIs. - 📊 DevTools *Timeline* from CI recording can be viewed locally in Chrome. - 🖼 Recordings take a *screenshot* available in build artefacts. - 🔥 Scenarios perform a *warmup* and multiple runs for more stable metrics.

-- Timo Tijhof

[1] Launch task: https://phabricator.wikimedia.org/T133646 [2] Phabricator project: https://phabricator.wikimedia.org/tag/fresnel/ [3] Task list: https://phabricator.wikimedia.org/maniphest/query/9w6EAEPPLQ72/#R