Performance

The Performance tab tracks Core Web Vitals from real user data. It is available on Rybbit Cloud, on the Standard plan or higher, for websites (not mobile apps).

Enabling Performance Tracking

Turn on Web Vitals in the Tracking tab of your site settings, or click Enable on the Performance page if you can configure the site. Web Vitals events count toward your monthly event usage.

Web Vitals

Largest Contentful Paint (LCP)

How long the main content takes to load.

• Good: Under 2.5 seconds
• Needs Improvement: 2.5-4 seconds
• Poor: Over 4 seconds

Cumulative Layout Shift (CLS)

How much content jumps around while loading.

• Good: Under 0.1
• Needs Improvement: 0.1-0.25
• Poor: Over 0.25

Interaction to Next Paint (INP)

How quickly your site responds to user interactions.

• Good: Under 200ms
• Needs Improvement: 200-500ms
• Poor: Over 500ms

First Contentful Paint (FCP)

How long until the first content appears.

• Good: Under 1.8 seconds
• Needs Improvement: 1.8-3 seconds
• Poor: Over 3 seconds

Time to First Byte (TTFB)

How long until the server responds.

• Good: Under 800ms
• Needs Improvement: 800-1800ms
• Poor: Over 1800ms

Percentiles

Choose which percentile the metric cards show (p50, p75, p90, p99). p75 is the default and is what Core Web Vitals assessments use. On the chart, toggle each percentile on or off to compare them.

Annotations

Click Annotations to show your annotations on the performance chart, so you can line up a change in speed with a deploy or launch.

Comparison

Each metric shows the change from the previous period, with green indicating improvement and red indicating degradation.

Breakdowns

• Pages - Find your slowest pages
• Countries, Regions, and Map - See geographic performance differences
• Devices - Compare mobile vs desktop performance
• Browsers - Identify browser-specific issues
• Operating systems - Compare performance across operating systems