Testing is one of those things that you either get super excited about or kinda close your eyes and walk away. Whichever camp you fall into, I’m here to tell you that front-end testing is for everyone. In fact, …
Critical CSS is one of those things I see in my performance reports but always seem to ignore. I know what it means. It means to put only the CSS required to render things immediately visible in a <style>…
Most images on the web are superfluous. If I might be a jerk for a bit, 99% of them aren’t even that helpful at all (although there are rare exceptions). That’s because images don’t often complement the text they’re …
IntersectionObserver and the fact that it avoids the use of methods that trigger reflows, like getBoundingClientRect. Also, 
Addy Osmani on images in HTML:
…The humble
<img>element has gained some superpowers over the years. Given how central it is to image optimization on the web, let’s catch up on what it can do and how it can
I’m willing to bet you know WebPageTest. It is the premier tool in the toolbox of web performance people. Maybe you didn’t know that WebPageTest was a side project of one fella, Patrick Meenan, for most of its lifetime, …
Raygun is an error and performance monitoring software for websites and mobile apps. In the case of websites, you install their JavaScript snippet onto your site, which takes 2 seconds, and now you’ve got monitoring in place. Why? Well now …
There is no doubt that CSS plays a huge role in web performance. Milica Mihajlija puts a point on exactly why:
…When there is CSS available for a page, whether it’s inline or an external stylesheet, the browser delays rendering
It’s certainly worth noting that the Space Jam website, which made its way into umpteen conference talks for being fabulous evidence of the web’s strength in backward compatibility, has been replaced. We could have saw that coming. Everything is …
Site performance is potentially the most important metric. The better the performance, the better chance that users stay on a page, read content, make purchases, or just about whatever they need to do. A 2017 study by Akamai says as …
Google has said that Core Web Vitals (CWV) are going to be an SEO factor, and the date is nigh: May 2021. So, I’m seeing some scrambling to make sure those metrics are good. Ya know, the acronym …
