CSSconf EU 2014 | Addy Osmani: CSS Performance Tooling

You’ve learned the concepts, now meet the tools. High-performance sites need to feel instant and deliver the goods in less than 1000ms. In this talk, learn about the bleeding edge tools that can automate keeping your CSS on the fast path. Automate generating critical-path CSS, removing unused CSS, discovering duplicate selectors, colors and more.

Along the way, we might even optimize a well known conference site and send them a pull request to help keep the web fast. The tools we’ll discuss can be used with Grunt, Gulp, Make or horse so strap yourself in and get ready for a ride into the crazier side of CSS performance optimization.


Addy Osmani is an engineer at Google focusing on tools to help improve developer productivity and satisfaction. He works with the Chrome team on projects like Polymer and is the the lead engineer on Web Starter Kit and Yeoman. He is known for his in-depth articles on web application architecture and the front-end.

Outside of Google, Addy…

Totally Tooling Tips: Critical Path CSS (S2 Mini Tip #1)

Optimising for the critical path is super important, check out a quick tip from Addy and Matt on testing and defining it.

Subscribe to the Chrome Developers channel at http://goo.gl/LLLNvf


0:10 – Critical Path CSS

0:41 – DevTools network throttling

0:55 DevTools Timeline Screenshots mode – https://developers.google.com/web/updates/2015/07/devtools-digest-film-strip-and-a-new-home-for-throttling?hl=en

Critical Node modules
http://github.com/addyosmani/critical (walkthrough: http://www.smashingmagazine.com/2015/08/understanding-critical-css/) and also https://github.com/pocketjoso/penthouse

Remote styles bookmarklet: https://gist.github.com/gauntface/0c9a02de2ea261aef0ec#file-toggle-remote-styles-js

Udacity Web Performance/Critical Path course https://www.udacity.com/wiki/ud884

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