Web Perf
Page speed and DOM structure: score, resource waterfall and technical notes. Choose where to measure from: Italy or Canada.
Limit: one analysis every 5 minutes per IP. Up to 40 resources per page. DNS is measured from the chosen node.
Frequently asked questions
What does Web Perf measure?
It measures the page from our server in Italy: time to first byte (TTFB), TCP and TLS connection, weight of the document and resources, number of requests, DOM size, render-blocking scripts and CSS, third parties and caching. It analyses the response HTML: JavaScript is not executed.
Why are LCP and CLS not shown?
Those metrics require a browser running the page. For real Core Web Vitals use PageSpeed Insights; Web Perf shows what causes them (blocking scripts, images without dimensions, weight).
Why one analysis every 5 minutes?
Each analysis downloads up to 40 resources, which is heavy for the server. The limit is per IP and keeps the service fast for everyone.