March 07, 2024

Getting a pulse on your Core Web Vitals 🩺 (JS Party #315)

1 hour 24 minutes

This week, Amal and Nick are joined by Rick Viscomi and Annie Sullivan from the Chrome team to dive into Core Web Vitals, a set of performance metrics geared towards helping developers surface web page quality signals that are key to delivering great user experiences.

We deconstruct the different vitals and learn how they are helpful, as well as introduce the newest vital to hit the scene, Interaction to Next Paint (INP). Join us for a fun and nerdtastic discussion as we dive into the humbling universe of web performance!

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Featuring:

Rick Viscomi – Website, X
Annie Sullivan – Website, Mastodon, X
Amal Hussein – GitHub, X
Nick Nisi – Website, GitHub, Bluesky, Mastodon, X

Show Notes:

Web performance resources

Why speed matters

Core Web Vitals docs

Interaction to Next Paint (INP)

Largest Contentful Paint (LCP)

Cumulative Layout Shift (CLS)

Measuring Core Web Vitals in the field

web-vitals.js library

Web Vitals Chrome extension

PageSpeed Insights

Chrome UX Report

Core Web Vitals Tech Report

In The Loop by Jake Archibald (🔥🔥🔥 Event Loop Talk referenced on show)

Scheduler API Polyfill

Scheduler.yield API Origin Trial

Speedcurve - Web performance monitoring

WebPageTest - Website performance and optimization test

WPO stats - Case studies and experiments demonstrating the impact of web performance optimization (WPO)

Partytown - Run 3rd Party Scripts from a Web Worker

Something missing or broken? PRs welcome!

...more

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