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?
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.
J’affirme ici que la non-qualité a des effets beaucoup plus graves sur la vie de ces populations. J’affirme que non, nous ne sommes pas égaux devant la non-qualité et que oui, si l’on se soucie vraiment de ces personnes, il est de notre devoir de proposer des contenus, des services, accessibles, sûrs, faciles à utiliser, simples, fiables, sobres et performants.
In this post, I want to look at ways to help mitigate and work around [the fact that site-speed is nondeterministic & most metrics are not atomic]. We’ll be looking mostly at the latter scenario, but the same principles will help us with the former. However, in a sentence:
With both solutions measuring user experience metrics, it is natural to assume that they should be equivalent. It can be confusing when we see differences. This guide will explain why that can happen, and offers suggestions for what to do when the numbers do not align.
Priority Hints are a newly released browser feature, currently available in Chrome and Edge, that give web developers the option of signaling relative load-time priorities of significant page resources. These hints are declared by way of a new "fetchpriority" attribute in the page's HTML markup and are relatively easy to apply.
Early Hints is a recent addition to the HTTP Informational response (1xx) status codes. Information response codes are temporary status codes used to inform the client about the status of the request, while the server is processing the request to send the final response code (2xx-5xx).
Early Hints is specifically used to pass information on the resources that may be preloaded by the client. The client will eventually need these resources when it renders the final response from the server.
CORS (Cross Origin Resource Sharing) enables web apps to securely access communicate across origins. But it comes with a performance penalty. In this tip, we'll discuss techniques for minimizing this penalty!