Performance

Calibre, the website performance testing app, launched a one-off Website Speed Test page anyone can use for free. This is nice it requires no special knowledge to use (anyone can type in a URL), the test can be run from significant geolocations (that probably aren’t where you live), and the test result is saved and […]

Learn how Interaction to Next Paint (INP) measures web interactivity, why it matters for user experience and SEO, and practical strategies to keep your site feeling fast and responsive.

Almost every site has at least one third-party script on it, and the average is 5. I’ve taken that from the blog post Introducing Nuxt Scripts from Harlan Wilton. While third-party scripts are a performance and security drain, they are, as Harlan puts it “fundamentally useful and aren’t going anywhere soon.” Typically, you just chuck […]

I enjoyed Micah R Ledbetter’s SVG triangle of compromise and generally think it’s a fair analysis of how any-which-way you use SVG on a page, you’re giving up some kind of nice ability it could have. For instance, if you use SVG through an <img> tag, it’s cached nicely, but you give up on CSS […]

I like how working on web performance is so well aligned with other worthy goals. A fast site is site more accessible to other people. A fast site tends to convert better. Using web standards and more native web technologies tends to lead to a faster site. SpeedCurve has published a pretty beefy and useful […]

You should know that in-app browser can and do literally inject JavaScript into the websites you visit with them with tracking scripts from the app you’re inside of. And that’s just one thing that sucks about them.

Ryan Seddon makes clear the potential performance problem with cross-page View Transitions: … on a slow or spotty network, the transition may appear as if the screen is freezing, as the browser waits for the page to load before it can transition smoothly between the two screens—this is not ideal. But also that our new […]

Which one makes more sense to use, big and slow or small and fast? Especially with the same appearance and functionality, the youtube-lite component is a no-brainer.

Boris Schapira takes a look at the Speculation Rules API that we just had a poke at around here. Boris notes that this idea of prefetching (or prerendering) the next page that a user might visit has quite a history. One of the players in this game, which is still a pretty good choice as […]

Not everybody has smokin’ fast internet. Wait let me try that again. Most people don’t have smokin’ fast internet, especially not all the time. It’s part of the job to make sure our sites aren’t so slow we’re essentially depriving users access. To experience your site with slow internet, under the Network tab of DevTools […]