URL: /rules/performance

---
title: "Performance"
description: "The Performance score group: page speed and loading behavior"
icon: "gauge"
---

Performance is one of the four score groups on every report. It measures page
speed and loading behavior: Core Web Vitals hints (LCP, CLS, INP), render
blocking, resource weight, caching, compression, and delivery.

The group is a single category with 29 rules. Most run locally against the HTML
and response headers; a few need [browser rendering](/guides/browser-rendering)
for measurements only a real browser can take.

## Category

<CardGroup cols={2}>
  <Card title="Performance" icon="folder" href="/rules/perf">
    Page speed and loading performance (29 rules)
  </Card>
</CardGroup>

## Disable all performance rules

```toml squirrel.toml
[rules]
disable = ["perf/*"]
```

See the [full rules reference](/rules) for the other score groups.