PageSpeed Insights (PSI)
PageSpeed Insights is a free tool from Google that analyzes the performance of a single webpage and provides suggestions for improvement. A key feature of PSI is that it reports both Lab Data from a simulated Lighthouse test and Field Data from the CrUX (Chrome User Experience Report) for the given URL, if available. This provides a holistic view, showing both a reproducible diagnostic score and the actual performance experienced by real users over the last 28 days.
Related web performance terms
- Page Load
Page Load refers to the entire process of a webpage becoming visible and interactive for a user, from the initial navigation request to the final rendering of content.
- Page Views (PIs)
Page Views is a metric that counts the total number of times a page on a website has been loaded or viewed by users. It is a fundamental measure of traffic and engagement.
- Passthrough Mode
Passthrough Mode is a temporary, protective state that Speed Kit enters when its Deployment Detection mechanism identifies a major website update.
- Periodic Updates
This is a scheduled, time-based mechanism that Speed Kit uses to keep its cache fresh. It can be configured to automatically re-check and update specific pages or assets at regular intervals (e.g.…