Performance

Everyone can improve performance. Choose from a range of basic to advanced solutions to the most common speed issues.

Learn about the unique advantages of synthetic monitoring and how you can use them to improve your site performance.

This is Part 1 of our new series on Building a Better YouTube Web called "Building a faster YouTube on web"

Let’s look at some more technical and non-obvious aspects of optimising Largest Contentful Paint

Performance Mistakes …an HTTP Archive Deep Dive Performance Architect @Etsy Paul Calvano @paulcalvano https://httparchive.org 3 How the HTTP Archive Works ● ...

Until you set specific goals, it’s not clear what metric you want to improve, how you’ll do it, and who’s in charge of getting it there. Learn how to set performance budgets to meet and maintain your speed goals.

In this post, Scott runs WebPageTest Pro Experiments on several popular websites to see how serving more meaningful HTML will impact their upfront performance.

So you want an auto-playing looping video without sound? In popular vernacular this is the very meaning of the word GIF. The word has stuck around but the

Any delay longer than 50 milliseconds and visitors sense that a page is unresponsive. Tracking and reducing your page’s Total Blocking Time is vital to avoiding a poor user experience.

We’ve open-sourced MemLab, a JavaScript memory testing framework that automates memory leak detection. Finding and addressing the root cause of memory leaks is important for delivering a quality us…

In this blog, we are going to learn the HTTP Request vs Http Long-Polling vs WebSocket vs Server-Sent Events(SSE).

Implement a straightforward framework to plan and deliver performance initiatives at your company.

When implementing performance fixes, it’s imperative that you measure the right thing—but what is ‘right’?

Large DOM sizes can be a factor in whether interactions are fast or not. Learn more about the relationship between DOM size and INP, and what you can do to reduce DOM size and other ways to limit rendering work when your page has lots of DOM elements.

La webPerf, c’est bien, mais en connaissant toutes les subtilités de la création de notre page c’est mieux \o/. Pendant 45 minutes, nous voyagerons à travers...

Keep your website online, boost performance and improve your digital experience to increase customer conversions.

Waterfaller, this FREE real-time tool leads web professionals through a step-by-step guidebook to boost your website's Core Web Vitals

Driving changes for better loading of third-party resources on the web

Find out what the browser preload scanner is, how it helps performance, and how you can stay out of its way.

In this blog post, we explain the technical details of removing the jQuery library from GOV.UK’s public facing applications and the performance impact it had for our users.

Image CDNs are excellent at optimizing images. Switching to an image CDN can yield a 40–80% savings in image bytes.

Why compressing images for dense screens is different, and how to serve them

How luxury retailer Farfetch's investment in improving Core Web Vitals led to better business outcomes.

Modern CSS rendering performance: The internals of web pages optimization In this talk, we demystify the browser’s rendering pipeline and explore the differe...

Developers started to notice just how big our JavaScript package was and yeah, we knew. We weren’t ignoring the issues; after all, we don’t want the Sentry package to be the cause of a slowdown. But to reduce our JavaScript SDK package size effectively we had to account for shipping new capabilities, like being able to manage the health of a release and performance monitoring, while maintaining a manageable bundle size. After all, new features == bigger package - usually.

This post covers the loading attribute and how it can be used to control the loading of images.

An in-depth course on images for the web.

There has never been a better time to deliver fast, resilient websites, but getting there demands an informed approach. So grab a hot beverage and let this guide illuminate the path forward.