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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

24

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
dashboard.stage.bio/static/bundle.js0.0 ms159.2 KiB
analytics.bundesregierung.de/piwik.js0.0 ms102.7 KiB
cdn.stage.bio/static/stage_icon_grey.svg0.0 ms4.5 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.22931] map[node:map[boundingRect:map[bottom:670 height:149 left:0 right:412 top:521 width:412] lhId:page-1-HEADER nodeLabel:Servicenavigation Schlagwortnavigation Hauptnavigation Inhalt path:1,HTML,1,BODY,3,HEADER selector:body.init > header.bpa-header snippet:<header class="bpa-header bpa-header-rebrush bpa-smaller-logo" data-shrinked-header-height-mobile="77" data-shrinked-header-height-tablet="154" data-shrinked-header-height-desktop="154"> type:node] score:0.22931]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/resource/crblob/2305928/601578769154ec077d6039c88e04694c...25 ms
/resource/crblob/2305926/079175810b05b317763e21e30cb8ba9f...10 ms
/resource/crblob/2305922/a232503217988a2553de47cf22822184...5.0 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:38.024 source:map[column:27131 line:11 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:1.532 source:map[column:185 line:266 type:source-location url:https://dashboard.stage.bio/static/bundle.js urlProvider:network]] map[reflowTime:0.981 source:map[column:833 line:266 type:source-location url:https://dashboard.stage.bio/static/bundle.js urlProvider:network]] map[reflowTime:0.729 source:map[column:34 line:266 type:source-location url:https://dashboard.stage.bio/static/bundle.js urlProvider:network]] map[reflowTime:3.451 source:map[column:2456 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.304 source:map[column:2486 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.294 source:map[column:2518 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.296 source:map[column:2549 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.263 source:map[column:2583 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.292 source:map[column:2621 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:0.154 source:map[column:4537 line:389 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:1.304 source:map[column:50126 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:0.872 source:map[column:50184 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:0.589 source:map[column:50248 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:0.357 source:map[column:54210 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:0.972 source:map[column:49430 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:0.902 source:map[column:51184 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:1.164 source:map[column:52597 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:14.675 source:map[column:49408 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:1.339 source:map[column:79092 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:3.444 source:map[column:58131 line:246 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:2.152 source:map[column:84631 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]] map[reflowTime:2.477 source:map[column:117969 line:307 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js urlProvider:network]] map[reflowTime:2.723 source:map[column:56168 line:10 type:source-location url:https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
www.bundesregierung.de/resource/themes/relaunch/css/relaunch-1562520-111.css235.9 KiB1.2 s

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Öltantanker in der Straße von Hormus, im Hintergrund sind Berge. div.bpa-slide-content > div.js-image-slider-picture > picture > img.bpa-img
/resource/image/2419572/16x9/599/337/f6fb2b772f2902a399c2...49.3 KiB16.4 KiB
Bundeskanzler Merz beim Rundgang über die Hannover Messe. a.bpa-hero-teaser-image-link > div.bpa-teaser-image-wrapper > picture > img.bpa-img
/resource/image/2421832/16x9/599/337/7bc5cc0cd65e49aef6d7...46.4 KiB13.5 KiB
Zwei Kinder stehen auf den Ruinen eines zerstörten Flüchtlingscamps in der Nähe… div.bpa-slide-content > div.js-image-slider-picture > picture > img.bpa-img
/resource/image/2327958/16x9/599/337/5d3e28120c31fdaafeeb...46.1 KiB13.2 KiB
Grafik mit der Aufschrift "Das ist die neue Bundesregierung" div.bpa-teaser-module-media-wrapper > div.bpa-teaser-image-wrapper > picture > img.bpa-img
/resource/image/2345138/16x9/553/311/cb43eb84057c5bb270cc...40.5 KiB12.5 KiB
Bundeskanzler Friedrich Merz bei einer Rede. div.bpa-teaser-inner-image > div.bpa-teaser-image-wrapper > picture > img.bpa-img
/resource/image/2422344/16x9/553/311/a3d49735c89ccd9605fb...34.1 KiB6.1 KiB
Kanzler Merz neben Frankreichs Präsident Macron, Großbritanniens Premier Starme… div.bpa-teaser-module-media-wrapper > div.bpa-teaser-image-wrapper > picture > img.bpa-img
/resource/image/2421812/16x9/553/311/5e28e47e43658556803b...33.4 KiB5.4 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.5 s
URLTime Spent
bundesregierung.de/758 ms
www.bundesregierung.de/755 ms
www.bundesregierung.de/breg-de0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Servicenavigation Schlagwortnavigation Hauptnavigation Inhalt body.init > header.bpa-header
0.229

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.1 s 223.7 KiB
URLTransfer SizeEst Savings
www.bundesregierung.de/resource/themes/relaunch/css/relaunch-1562520-111.css235.7 KiB223.7 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.9 s 582.2 KiB
URLTransfer SizeEst Savings
www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js569.9 KiB419.4 KiB
dashboard.stage.bio/static/bundle.js158.8 KiB98.5 KiB
analytics.bundesregierung.de/piwik.js102.3 KiB64.3 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js2.5 s1.6 s341 ms
www.bundesregierung.de/breg-de2.4 s62 ms13 ms
dashboard.stage.bio/static/bundle.js669 ms202 ms75 ms
Unattributable342 ms9.3 ms0.0 ms
www.bundesregierung.de/resource/themes/relaunch/css/relaunch-1562520-111.css320 ms0.0 ms0.0 ms
analytics.bundesregierung.de/piwik.js103 ms83 ms16 ms
www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js103 ms27 ms15 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation2.0 s
Other1.4 s
Style & Layout997 ms
Rendering919 ms
Parse HTML & CSS612 ms
Script Parsing & Compilation460 ms

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 2,158 KiB
●Avoid long main-thread tasks 12 long tasks found
●Avoid non-composited animations 2 animated elements found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 10 ms
●Server Backend Latencies 10 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 10 ms
○INP breakdown
○LCP request discovery
○User Timing marks and measures
96

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li.checkbox > label > span > input#cookie-allow-necessary li.checkbox > label > span > input#cookie-allow-necessary
li.checkbox > label > span > input#cookie-allow-tracking li.checkbox > label > span > input#cookie-allow-tracking

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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