core-web-vitals
Optimizes static websites for best user experience and best Core Web Vitals scores.
jampack is a post-processing tool that takes the output of your Static Site Generator (aka SSG) and optimizes it for best user experience and best Core Web Vitals scores.
Page speed monitoring. Web performance library for measuring all performance vitals metrics.
Perfume is a tiny, web performance monitoring library that reports field data back to your favorite analytics tool.
Page Speed is a feature, and to deliver it we need to understand the many factors and fundamental limitations that are at play. If we can measure it, we can improve it.
View the source of this page for an example of how to implement a lightweight preview image for YouTube videos that is resilient to image load failures. There is no iframe on this page at load time. The iframe is only created when the user clicks the preview.
Related contents:
Critical CSS refers to the minimal set of CSS rules required to render the visible portion of a webpage (above the fold). By extracting and inlining this CSS into your HTML, the browser can render content faster without waiting to load all stylesheets, improving performance and Core Web Vitals like First Contentful Paint (FCP).