April 23, 2014 — Phil Karlton once said, “There are only two hard things in Computer Science: cache invalidation and naming things.” This article is about the harder of these two: cache invalidation. It’s directed at readers who already work with Varnish Cache. To learn more … Read More…

December 4, 2013 — Imagine that you have just written a post on your blog, tweeted about it and watched it get retweeted by some popular Twitter users, sending hundreds of people to your blog at once. Your excitement at seeing so many visitors talk about your post turns to dismay as they start … Read More…

September 16, 2013 — Five-inch mobile devices are on the market that have the same screen resolution as 50-inch TVs. We have users with unlimited high-speed broadband as well as users who pay money for each megabyte transferred. Responsive design for images is about optimizing the process of … Read More…

August 27, 2013 — In Part 1 of this series, we had a look at how the underlying protocols of the Web work, and how we can use JavaScript to estimate their performance characteristics. In this second part, we’ll look at DNS, IPv6 and the new W3C specification for the NavigationTiming API. Read More…

August 16, 2013 — Despite improvements in broadband and wireless Internet, load is in many ways more of an issue now than it was five years ago. The proliferation of mobile devices, increased user expectations, and the very real risks of losing customers and dropping in search result rankings … Read More…

August 12, 2013 — This article features just one of the many solutions for creating high-performance mobile websites. We suggest that you review different approaches such as Building A Responsive Web App, Improving Mobile Support and Making Your Websites Faster before choosing a particular … Read More…

June 10, 2013 — Today we’ll discuss how to improve the paint performance of your websites and Web apps. This is an area that we Web developers have only recently started looking at more closely, and it’s important because it could have an impact on your user engagement and user experience. Read More…

April 9, 2013 — In many ways, responsive Web design deserves a big share of the honor for making the Web more usable on non-desktop devices. This trend of letting the browser determine more about how a Web page should be displayed makes sense, especially now that mobile browsers are … Read More…

April 3, 2013 — A recent study (PDF) found that more than 80% of people are disappointed with the experience of browsing Web on mobile devices and would use their smartphones more if the browsing experience improved. Read More…