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Category: Performance

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The popover drama

The popover drama started with a tweet about how a HEY Calendar popover loaded slowly on a throttled internet connection.

Speedometer 3.0: The Best Way Yet to Measure Browser Performance

Apple’s WebKit team is excited to introduce Speedometer 3.0, a major update that better reflects the Web of today.

JavaScript Bloat in 2024

What is the average size of JavaScript code downloaded per website? Let's find out!

Lossy CSS compression for fun and loss (or profit)

Late last year, I had an idea that’s been steadily brewing in my head.

Fixing Cumulative Layout Shift Problems

Cumulative Layout Shift (CLS) is one of the Core Web Vital performance metrics.

Getting started with Web Performance

Web performance can be pretty tricky. I mention this so you don’t get demoralized if you hit a wall or struggle to identify an issue.

Preparing For Interaction To Next Paint, A New Web Core Vital

Starting in March 2024, Interaction to Next Paint will formally replace First Input Delay as a Core Web Vital metric.

The Three Cs: 🤝 Concatenate, 🗜️ Compress, 🗳️ Cache

We know we should do it, but do we know how?

The Ultimate Low-Quality Image Placeholder Technique

Can Low-Quality Image Placeholders and LCP play nicely together?

Stop Lazy Loading Product and Hero Images

I see a recurring performance problem on many ecommerce sites—the most important images on the page are being lazy loaded when they shouldn’t be.

How We Optimized Performance To Serve A Global Audience

How Liran Cohen and the team at Bookaway, a travel booking service, dramatically improved their site’s performance.

Core Web Vitals for Search Engine Optimisation: What Do We Need to Know?

There’s still a lot of misunderstanding about CWV for SEO. Let’s work it out together.

Reducing Complexity in Front End Development

As web applications grow larger, they inevitably fall prey to complexity, despite our best intentions.

300ms Faster: Reducing Wikipedia’s Total Blocking Time

How two simple steps improved the responsiveness of Wikipedia’s mobile site.

2023 Web Framework Performance Report

A look at how different web frameworks perform in the real world in 2023.

The Market for Lemons

New web services are being built to a self-defeatingly low UX and performance standard.

The truth about CSS selector performance

If you’re a web developer, you may have already heard that some CSS selectors are faster than others.

Our top Core Web Vitals recommendations for 2023

A collection of best practices for optimizing websites’ Core Web Vitals performance based on the state of the web in 2023.

The Performance Inequality Gap, 2023

When digital is society's default, slow is exclusionary.

Conditionally Adaptive CSS

Browser behavior that might improve your performance.