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?

Finding out how browser and proxy caches behave (and misbehave)

Progressive enhancement. Because sometimes your JavaScript just won’t work.

– Collect user errors
– Normalize & De-duplicate
– Cluster similar errors
– Measure User Impact
– Handle Script Error

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)

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)

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…