Performance score group: how page speed is scored
The Performance score group: page speed and loading behavior
Performance is one of the four score groups on every report, alongside SEO, Security and Agents. It covers page speed and loading behaviour: the markup patterns behind LCP, CLS and INP, render blocking, resource weight, caching, compression and delivery. The group holds two categories: Performance, whose rules read the HTML and response headers and flag the causes of a slow page rather than measuring LCP, INP or CLS; and Reliability, which checks that the scripts and stylesheets a page references actually load and that its forms can be submitted.
See Core Web Vitals for how an agent works through a report.
Category
Page speed and loading performance (30 rules)
Runtime errors, broken resources and failed requests (2 rules)
Disable all performance rules
[rules]
disable = ["perf/*"]See the full rules reference for the other score groups.