CategoryPerformance

September 18, 2025 — As responsible digital professionals, we are becoming increasingly aware of the environmental impact of our work and need to find effective and pragmatic ways to reduce it. James Chudley shares a new decarbonising approach that will help you to minimise the environmental impact of your website, benefiting people, profit, purpose, performance, and the planet. Read more…

March 6, 2025 — Struggling with slow Largest Contentful Paint (LCP)? Newly introduced by Google, LCP subparts help you pinpoint where page load delays come from. Now, in the Chrome UX Report, this data provides real visitor insights to speed up your site and boost rankings. Matt Zeunert unpacks what LCP subparts are, what they mean for your website speed, and how you can measure them. Read more…

February 12, 2025 — Optimizing web performance means looking beyond surface-level metrics. Time to First Byte (TTFB) is crucial, but improving it requires more than tweaking server response time. Matt Zeunert breaks down what TTFB is, what causes its poor score, and why reducing server response time alone isn’t enough for optimization and often won’t be the most impactful change you can make to your website. Read more…

January 9, 2025 — We know that browsers do all sorts of different things under the hood. One of those things is the way they not only fetch resources like images and scripts from the server but how they prioritize those resources. Chrome and Safari have implemented a “Tight Mode” that constrains which resources are loaded and in what order, but they each take drastically different approaches to it. With so little information about Tight Mode available, this article attempts a high-level explanation of what it is, what triggers it, and how it is treated differently in major browsers. Read more…

January 7, 2025 — Product drops and sales are a great way to increase revenue, but these events can result in traffic spikes that affect a site’s availability and performance. To prevent website crashes, you’ll have to make sure that the sites you design can handle large numbers of server requests at once. Let’s discuss how! Read more…

November 5, 2024 — Feeling good with your Lighthouse score of 100%? You should! But you should also know that you’re only looking at part of the performance picture. Learn how Lighthouse scores are measured differently than other tools, the impact that has on measuring performance metrics, and why you need real-user monitoring for a complete picture. Read more…

June 11, 2024 — Do perfect Lighthouse scores mean the performance of your website is perfect? As it turns out, Lighthouse is influenced by a number of things that can be manipulated and bent to make sites seem more performant than they really are, as Salma Alam-Naylor demonstrates in several experiments. Read more…

June 4, 2024 — The web is still a young platform, and we’re only now beginning to recognize what “success” looks like for large projects. In his recent Smashing book, Success at Scale, Addy Osmani presents practical case studies featuring the web’s most renowned companies and their efforts to make big changes to existing apps and sites. In this article, Addy shows some of the key insights he has learned. Read more…

May 9, 2024 — React Server Components (RSCs) combine the best of client-side rendering, and author Lazar Nikolov thoroughly examines how we got here with a deep look at the impact that RSCs have on the page load timeline. Read more…

April 16, 2024 — The three Core Web Vitals metrics don’t only tell you how visitors experience your website but also impact your Google search result rankings. In this article, we’ll look at what Core Web Vitals are, how they are measured, and how you can use DebugBear to monitor them continuously. Read more…