perf_workshop

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A workshop on web performance and developer tools used to measure it

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# Get in the Fast Lane: Measuring Web Performance

- [Abstract](#abstract)
- [Prerequisites](#prerequisites)
- [About the trainer](#about-the-trainer)
- [Slides and controls](#slides-and-controls)
- [Resources](#resources)

## Abstract

Are you losing revenue to performance? 53% of mobile site visits are abandoned if a page takes longer than 3 seconds to load. Pinterest reduced load times by 40% and saw a 15% increase in sign ups. Starbucks implemented a 2x faster time to interactive resulting in a 65% increase in rewards registrations. AliExpress reduced load by 36% and saw a 10.5% increase in orders.

Performance is important. Tooling can be hard. Do flame charts intimidate you? Come learn how to audit and fix common performance issues using Chrome DevTools, Lighthouse, PageSpeed Insights, and webpagetest.org. During this hands-on, full-day workshop, you will learn how to:

- Optimize and familiarize yourself with your DevTools environment
- Understand which metrics matter
- Measure the performance of existing applications
- Diagnose and prioritize performance problems
- Implement performance fixes

We will profile real applications to both learn the tools of measurement as well as see real performance problems in action. By the end of this workshop, you will be familiar with the following performance concepts. Many will be covered in-depth with exercises, and others will be covered in an overview with resources to learn more.

- Latency and loading: HTTP2, code splitting, caching and service workers, resource and priority hints, progressive rendering and lazy loading, third party scripts
- Reducing code: tree shaking, responsible imports, performance budgets, differential serving
- Assets: responsive images, font loading, network client hints
- Buttery smooth UI: long-running JavaScript
- Perceived performance and UX

## Prerequisites

To attend this workshop, you must already have a working understanding of JavaScript, HTML, CSS, and the command line. In addition, you must be comfortable using npm (or yarn) to install packages and run scripts in a project. You must also have a basic understanding of Chrome DevTools, including inspecting an element and using the console. You do not need advanced mastery of DevTools as we will be learning about the Network and Performance tabs plus other tools during this session. A basic understanding of webpack would be helpful but is not required.

## Preparation

Please come with a laptop charged and ready for development. You must have Chrome (latest or version 76+), Node (at least version 8+, 12+ preferred), npm (at least version 5+, 6+ preferred) or yarn (latest), and Git installed. All instructions will use npm, but you are welcome to use yarn instead as long as you know how to run the analogous commands.

## About the trainer

**Sia Karamalegos** is a web developer passionate about performance as well as an international conference speaker and writer. She is a Google Developer Expert in Web Technologies and a Women Techmakers ambassador. She co-organizes #FrontEndParty, GDG New Orleans, and NOLA Hack Night in the New Orleans area. She is the founder and lead developer for Clio + Calliope Web Development and was recognized in the Silicon Bayou 100, the 100 most influential and active people in tech and entrepreneurship in Louisiana. When she's not coding, speaking, or consulting, Sia likes to write stories and dabble in charcoal figure drawing. She's also an avid endurance athlete.

[Twitter](https://twitter.com/thegreengreek) | [Website](https://siakaramalegos.github.io/) | [Github](https://github.com/siakaramalegos) | [Blog](https://medium.com/@thegreengreek) | [StackOverflow](https://stackoverflow.com/users/5049215/sia?tab=profile) | [LinkedIn](https://www.linkedin.com/in/karamalegos)

## Slides and Controls

The slides are deployed [here](https://glittery-starship-29cecf.netlify.app). To advance the slides, use `n` for next and `p` for previous. The right arrow jumps to the next section (and left for previous section). Up and down to advance through slides within a section.

## Resources

Want to learn more about how to measure and improve performance? Here you go:

- [Modern DevTools course](https://moderndevtools.com/) by Umar Hansa
- [/dev tips](https://umaar.com/dev-tips/) by Umar Hansa
- [Optimize Website Speed with Chrome DevTools](https://developers.google.com/web/tools/chrome-devtools/speed/get-started) by Kayce Basques
- [Assessing Loading Performance in Real Life with Navigation and Resource Timing](https://developers.google.com/web/fundamentals/performance/navigation-and-resource-timing/) by Jeremy Wagner
- [User Timing API – Measuring User Experience Performance](https://www.keycdn.com/blog/user-timing/) by Cody Arsenault
- [Measure Performance with the RAIL Model](https://developers.google.com/web/fundamentals/performance/rail) by Meggin Kearney, et. al.
- [Reduce JavaScript Payloads with Tree Shaking](https://developers.google.com/web/fundamentals/performance/optimizing-javascript/tree-shaking/) by Jeremy Wagner
- [Reduce JavaScript Payloads with Code Splitting](https://developers.google.com/web/fundamentals/performance/optimizing-javascript/code-splitting/) by Jeremy Wagner and Addy Osmani
- [Lazy Loading Images and Video](https://developers.google.com/web/fundamentals/performance/lazy-loading-guidance/images-and-video/) by Jeremy Wagner
- [The Cost of JavaScript in 2018](https://medium.com/@addyosmani/the-cost-of-javascript-in-2018-7d8950fbb5d4) by Addy Osmani
- [The Cost of JavaScript](https://medium.com/dev-channel/the-cost-of-javascript-84009f51e99e) by Addy Osmani
- [Why Web Developers Need to Care about Interactivity](https://philipwalton.com/articles/why-web-developers-need-to-care-about-interactivity/) by Philip Walton
- [Preload, Prefetch And Priorities in Chrome](https://medium.com/reloading/preload-prefetch-and-priorities-in-chrome-776165961bbf) by Addy Osmani
- [Webpack build analysis](https://survivejs.com/webpack/optimizing/build-analysis/) on SurviveJS by Juho Vepsäläinen
- [https://www.webpagetest.org/easy](https://www.webpagetest.org/easy) easy no configuration set up for a slow-3G connection and mid-level phone, specifically Chrome on a Motorola G (gen 4) tested from Dulles, Virginia on a 400 Kbps 3G connection with 400ms of latency.
- [Responsive Images](https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images) by MDN
- [Responsive Images](https://developers.google.com/web/fundamentals/design-and-ux/responsive/images) by Pete LePage
- [Responsive Images Udacity Course](https://www.udacity.com/course/responsive-images--ud882) by Google
- [Optimizing Images](https://survivejs.com/webpack/loading/images/#optimizing-images) in Webpack on SurviveJS by Juho Vepsäläinen
- [Can You Afford It?: Real-world Web Performance Budgets](https://infrequently.org/2017/10/can-you-afford-it-real-world-web-performance-budgets/) by Alex Russell
- [Deploying ES2015+ Code in Production Today](https://philipwalton.com/articles/deploying-es2015-code-in-production-today/) by Philip Walton
- [HTTP Caching](https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching) by Ilya Grigorik
- [Take a (Client) Hint!](https://www.youtube.com/watch?v=md7Ua82fPe4&list=PLe9psSNJBf75O6abYvvjxhm36_QU9H-f2&index=16) by Jeremy Wagner
- [To push, or not to push?! - The future of HTTP/2 server push](https://www.youtube.com/watch?v=ga_-zsTHRm8&list=PLe9psSNJBf75O6abYvvjxhm36_QU9H-f2&index=24) by Patrick Hamann
- [The Future is Fast](https://jlengstorf.github.io/presentations/the-future-is-fast/#/) on performance and Gatsby.js by Jason Lengstorf
- If you have the chance, attend one of [Harry Robert's talks or workshops](https://csswizardry.com/workshops/) on performance
- [Does my site need HTTPS?](https://doesmysiteneedhttps.com/)

Other sources:

- [Speed is now a landing page factor for Google Search and Ads](https://developers.google.com/web/updates/2018/07/search-ads-speed) by Addy Osmani and Ilya Grigorik
- [WPO Stats](https://wpostats.com/) - Case studies and experiments demonstrating the impact of web performance optimization (WPO) on user experience and business metrics
- [Why performance matters](https://developers.google.com/web/fundamentals/performance/why-performance-matters/) by Jeremy Wagner
- [End to End Apps with Polymer (Polymer Summit 2017)](https://www.youtube.com/watch?v=0A-2BhEZiM4) talk by Kevin Schaaf which also shows the time to interactive video
- [This is why I prefer Progressive Rendering + Bootstrapping.](https://twitter.com/aerotwist/status/729712502943174657) tweet by Paul Lewis with graphic comparing progressing rendering with SSR and CSR
- [Why Waiting Is Torture](http://www.nytimes.com/2012/08/19/opinion/sunday/why-waiting-in-line-is-torture.html) by Alex Stone
- [The Truth About Download Time](https://articles.uie.com/download_time/) by Christine Perfetti
- [The need for mobile speed: How mobile latency impacts publisher revenue](https://www.doubleclickbygoogle.com/articles/mobile-speed-matters/) report by DoubleClick by Google

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