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How you order elements in the <head> can have an effect on the (perceived) performance of the page.
This script helps you identify which elements are out of order.
A beautiful letter to progressive enhancement.
While implementing third-party resources has downsides for performance and you should self-host your assets when possible, sometimes relying on external files is unavoidable. But be warned — using them can sometimes cause real headaches.
The only thing React is better at than other front-end frameworks is being popular. So how long will that self-perpetuating cycle continue?
New web services are being built to a self-defeatingly low UX and performance standard, and existing experiences are now pervasively re-developed on unspeakably slow, JS-taxed stacks. At a business level, this is a disaster, raising the question: why are new teams buying into stacks that have failed so often before?
An updated overview of image loading optimization methods to improve LCP.
Drag-and-drop a trace (or select a file)
We'll upload it and give you a shareable URL, with the Chrome DevTools Performance Panel…
Traces expire after 90 days. 🕶
In short, we wanted our list of top web performance recommendations to focus on:
- Recommendations we believe will have the largest real-world impact
- Recommendations that are relevant and applicable to most sites
- Recommendations that are realistic for most developers to implement
Priority Hints are used to indicate to the browser the relative priority of a resource. I take a deep dive into how you can improve your Largest Contentful Paint by using fetchpriority.
Designing, developing or leading a web project (or an app) have inherent constraints, and adding to them might take time and resources you do not have. On the other hand, avoiding non-quality can bring you much in lost revenue through better position on search engines, better compatibility, speed and accessibility leading to a lesser quit rate, or better word-of-mouth following great after-sale service.
A tree view (collapsible list) can be created using only html and css, without the need for JavaScript. Accessibility software will see the tree view as lists nested inside disclosure widgets, and the standard keyboard interaction is supported automatically.
For technical teams I advise to additionally track LCP(FE), or the Front End Component of LCP.
If nothing else, my hope is that this post helped shed some light on the fact that LCP is, by its very nature, a dynamic metric that is heavily dependent on user behavior. You can’t always know ahead of time what the LCP element is going to be for a given page, so it’s important that your optimization techniques can handle a range of possible outcomes, and adapt accordingly.
When measuring web performance, we often try to get a single number that we can trend over time. This may be the median page load time, hero image time, page speed score, or core web vitals score. But is it really that simple?
– Collect user errors
– Normalize & De-duplicate
– Cluster similar errors
– Measure User Impact
– Handle Script Error
When it comes to error handling, it truly is a team sport
Creating a performance story can only start with the data. Having a better understanding of your app’s state and continuously measuring and monitoring it is key to making sure you can ship the most impactful results to your users.
via Perf NL (https://calibreapp.com/newsletter)
Accessibility is a holistic practice that touches every aspect of creating a digital experience. This means it is also a backend web development consideration
via Perf NL (https://calibreapp.com/newsletter)
Finding out how browser and proxy caches behave (and misbehave)
You probably heard about the stories of Walmart that increased their conversion rate by 2% for every less second their page would take to load. While we found a clear correlation between page…