Analysis

Performance

Available since v3.1.0

Performance tracks real-user Core Web Vitals collected directly from your visitors' browsers. Use it to identify slow pages, spot regressions over time, and compare performance across devices and browsers.

Use Cases#

Identify slow-loading pages that may be hurting user experience or SEO rankings.
Compare Core Web Vitals across different devices, browsers, and regions.
Validate the impact of performance improvements over time.

Usage#

Add the data-performance attribute to your tracking script to enable automatic collection of Core Web Vitals.

<script
  defer
  src="http://mywebsite.com/umami.js"
  data-website-id="94db1cb1-74f4-4a40-ad6c-962362670409"
  data-performance="true"
></script>

Once enabled, Umami will automatically capture performance metrics from your visitors' browsers and report them under the Performance tab for that website.

If you are tracking pageviews manually, keep auto-track enabled and add data-auto-pageview="false" instead of data-auto-track="false". This manual pageview setup requires v3.2.0 or later.

<script
  defer
  src="http://mywebsite.com/umami.js"
  data-website-id="94db1cb1-74f4-4a40-ad6c-962362670409"
  data-auto-pageview="false"
  data-performance="true"
></script>

Metrics#

Metric	Description
LCP	Largest Contentful Paint — time until the largest visible element is rendered.
INP	Interaction to Next Paint — responsiveness of the page to user interactions.
CLS	Cumulative Layout Shift — visual stability; lower is better.
FCP	First Contentful Paint — time until the first content is rendered on screen.
TTFB	Time to First Byte — time from request to first byte received from the server.

Thresholds#

Each metric is rated against Google's defined thresholds:

Metric	Good	Needs Improvement	Poor
LCP	< 2,500 ms	2,500 – 4,000 ms	> 4,000 ms
INP	< 200 ms	200 – 500 ms	> 500 ms
CLS	< 0.1	0.1 – 0.25	> 0.25
FCP	< 1,800 ms	1,800 – 3,000 ms	> 3,000 ms
TTFB	< 800 ms	800 – 1,800 ms	> 1,800 ms

Percentiles#

Results are displayed at three percentile levels:

Percentile	Description
p50	Median — half of users experience this or better.
p75	75th percentile — the value most users experience. Google uses this for Core Web Vitals scoring.
p95	95th percentile — represents the worst-case experience for most users.

Viewing Performance#

Navigate to a website and click the Performance tab.

Select a metric card to focus the chart on that metric. Use the Percentile dropdown to switch between p50, p75, and p95.

Pages and Environment breakdowns#

The bottom of the page shows the selected metric broken down by Pages (path or title) and Environment (device or browser), helping you pinpoint which pages or clients are underperforming.

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