Most people have figured out that the average response time for a web service is a very poor estimate of it’s behavior, as responses are…

Learn how to optimize for the Time to First Byte metric.

On entend souvent dire que les plugins ralentissent WordPress. Est-ce un mythe ou la réalité? Voyez la réponse détaillée.

We worked with Sunday Citizen to improve their key performance metrics and were able to achieve 25% improvement in Largest Contentful Paint and 61% in Cumulative Layout Shift at the 75th percentile. This resulted in 4% decrease in bounce rate and over 6% increase in conversion. Web performance is often overlooked as a

If you feel somewhat restricted by the flexibility of layouts provided by WordPress themes, you might be interested in building your WordPress webpages with a page builder plugin. WordPress page builders have become wildly popular because they let anyone, even those without the gift of code, build a beautiful website or landing page using a […]

Slow WordPress plugins impact the performance of your site. Here is a list of known slow plugins, and the better alternatives.

The subject of Web resource caching is as old as the World Wide Web itself. However, I’d like to offer an as-exhaustive-as-possible catalog of how one can improve performance by caching. Web resource caching can happen in two different places: client-side - on the browser and server-side. This post is dedicated to the former; the next post will focus on the latter. Caching 101 The idea behind caching is simple: if a resource is a time- or resource-consuming to compute, do it once and st

If your "quest for fast" goes through device detection, you'll want to pay attention to this. Introduction I'll go out on a limb and make a wild guess: if you care about web performance, that's because you want to deliver great UX to users. Assuming my guess is right, in the last two decades the per

A few weeks ago at performance.now(), we were able to announce the initial availability of a new public dataset of RUM data - the RUM Archive. I'd like to take a few minutes to discuss our motivation for the project, what kind of data the RUM Archive contains, how you can access it, its limitations

Introduction A Swiss Army knife is not merely a knife but rather an entire toolbox packaged in a light and compact container. Each tool is carefully selected to maximize utility while simultaneously minimizing size and redundancy. Mastery of the toolbox means knowing when and how to use each availab

Prologue In 1949, Claude Shannon married a computer. Her name was Betty.1 Mary Elizabeth “Betty” Moore graduated from the New Jersey College for Women in 1948 and began work the next day as a computer at Bell Laboratories.2 Her job was to perform mathematical calculations for Bell Labs engineerin

Largest Contentful Paint (LCP) is a performance metric representing the user experience's loading facet. It's part of the Core Web Vitals program and measures the render time of the largest image or text block visible within the viewport. When the LCP element is an image, which happens 72% of the ti

A 2022 talk about CSS runtime performance by Nolan Lawson.

Fast page loading is so last year… you should be thinking about instant page loads! To give an experience where the load is not just “acceptable”, but completely unnoticeable, we need to look beyond just optimising our loading speeds and think about how we can completely hide that load delay from th

One of the best performance tips is "do less" - transmit less data and do less processing. There are a million details but we will focus on transmitting less...

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’?