Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
vitruv.uni-tuebingen.de/piwik/piwik.js	0.0 ms	22.1 KiB

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.

URL	Est Savings
/_assets/7d66ab3e4599366251c5af46f0e770b9/Fonts/uticonfon...	40 ms
/_assets/7d66ab3e4599366251c5af46f0e770b9/Fonts/open-sans...	40 ms
/_assets/7d66ab3e4599366251c5af46f0e770b9/Fonts/open-sans...	40 ms
/_assets/7d66ab3e4599366251c5af46f0e770b9/Fonts/open-sans...	35 ms
/_assets/7d66ab3e4599366251c5af46f0e770b9/Fonts/open-sans...	35 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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:31.57 source:map[type:text value:[unattributed]]]]

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.

	URL	Resource Size	Est Savings
zu den Forschungsschwerpunkten `div#c1658970 > div.ut-text-media__contentcontainer > picture.ut-picture > img.ut-img`	uni-tuebingen.de/fileadmin/_processed_/0/8/csm_ZMBP_79d7ad216d.jpg	77.7 KiB	65.2 KiB
zur Exzellenzstrategie `div#c1658961 > div.ut-text-media__contentcontainer > picture.ut-picture > img.ut-img`	uni-tuebingen.de/fileadmin/_processed_/5/1/csm_Reagenzglas_705df891ff.jpg	52.2 KiB	39.8 KiB
div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img `div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img`	uni-tuebingen.de/fileadmin/_processed_/e/c/csm_26-04-01-SSP_3b_0f170b683d.jpg	44.6 KiB	33.0 KiB
zur Seite Innovation `div#c1658973 > div.ut-text-media__contentcontainer > picture.ut-picture > img.ut-img`	uni-tuebingen.de/fileadmin/_processed_/1/0/csm_innovation_e2d3e091ba.jpg	37.0 KiB	27.4 KiB
zur Seite International `div#c1658964 > div.ut-text-media__contentcontainer > picture.ut-picture > img.ut-img`	uni-tuebingen.de/fileadmin/_processed_/c/a/csm_International_609f4b38fa.jpg	35.7 KiB	26.4 KiB
Ein Student und eine Studentin laufen einen Gang entlang, haben Bücher in der H… `div.ut-figure__img-wrapper > div.ut-figure__img-wrapper-inner > picture.ut-picture > img.ut-picture__img`	/fileadmin/_processed_/d/8/csm_Studiengang_Uni_Tübingen-...	32.9 KiB	8.0 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-2-IMG

nodeLabel: div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img

path: 1,HTML,1,BODY,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,PICTURE,4,IMG

selector: div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img

snippet: <img class="ut-picture__img ut-carousel__img" src="https://uni-tuebingen.de/fileadmin/_processed_/e/c/csm_26-04-01-SSP_3b_0f1…" width="1916" height="492" alt="">

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

value: No additional origins are good candidates for preconnecting

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.

URL	Transfer Size	Duration
/typo3temp/assets/compressed/merged-f74453d11ab0afcdd8d11...	375.1 KiB	1.8 s
/typo3temp/assets/compressed/merged-bd4e15f76b5eaecf93c9c...	289.7 KiB	1.5 s
/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic....	3.9 KiB

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

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

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.

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: 1.5 s 263.2 KiB

URL	Transfer Size	Est Savings
/typo3temp/assets/compressed/merged-bd4e15f76b5eaecf93c9c...	288.3 KiB	263.2 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: 1.5 s 285.2 KiB

URL	Transfer Size	Est Savings
/typo3temp/assets/compressed/merged-f74453d11ab0afcdd8d11...	373.4 KiB	228.1 KiB
/_assets/948410ace0dfa9ad00627133d9ca8a23/JavaScript/Powe...	76.0 KiB	57.2 KiB

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,438 KiB

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.7 s

●Avoid long main-thread tasks 3 long tasks found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 30 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 170 ms

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

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

When an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ul.ut-switchbar__list > li#switchbar-search > div#switchblock-search > span.ut-switchblock__close-icon `ul.ut-switchbar__list > li#switchbar-search > div#switchblock-search > span.ut-switchblock__close-icon`
ul.ut-switchbar__list > li#switchbar-login > div#switchblock-login > span.ut-switchblock__close-icon `ul.ut-switchbar__list > li#switchbar-login > div#switchblock-login > span.ut-switchblock__close-icon`
ul.ut-switchbar__list > li#switchbar-language > div#switchblock-language > span.ut-switchblock__close-icon `ul.ut-switchbar__list > li#switchbar-language > div#switchblock-language > span.ut-switchblock__close-icon`

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-search > button#ut-identifier--search-toggle `nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-search > button#ut-identifier--search-toggle`
nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-login > button.ut-switchbar__toggle `nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-login > button.ut-switchbar__toggle`
nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-language > button.ut-switchbar__toggle `nav.ut-page-header__switch > ul.ut-switchbar__list > li#switchbar-language > button.ut-switchbar__toggle`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-essential `div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-essential`
div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-external `div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-external`
Alle akzeptieren `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
Speichern & schließen `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
Essentiell `div.in2-modal__blackbox > div.in2-modal > dl.in2-modal-accordion > dt.in2-modal-accordion__title`
Videos `div.in2-modal__blackbox > div.in2-modal > dl.in2-modal-accordion > dt.in2-modal-accordion__title`
Impressum `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-flexline > a.in2-modal-link`
Datenschutzerklärung `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-flexline > a.in2-modal-link`

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
21. Mediendozentur: Die neue Weltunordnung `a.ut-news-item__link > div.ut-news-item > div.ut-news-item__content > h4.ut-heading`
Öffentlichkeit im Umbruch: Wie Medien Markt und Miteinander verändern `a.ut-news-item__link > div.ut-news-item > div.ut-news-item__content > h6.ut-heading`
Exzellenzstrategie `div#c1658961 > div.ut-text-media__contentcontainer > div.ut-box__block > h5.ut-heading`
Service `div.ut-grid__col-1 > div#footerpanel-1 > div#footerpanel-1-ph > h6.ut-heading`

These are opportunities to improve keyboard navigation in your application.

○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-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●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.

●Select elements have associated label elements.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

●Definition list items are wrapped in `<dl>` elements

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●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

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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

○ARIA IDs are unique

○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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○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.

○`[lang]` attributes have a valid value

○`<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.

○Elements with visible text labels have matching accessible names.

○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.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
5 Studierende laufen über den Campus Morgenstelle `div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img`	/fileadmin/_processed_/a/f/csm_23-09-11_Studienanfang_fa4...	1920 x 1295 (1.48)	767 x 322 (2.38)
div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img `div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img`	/fileadmin/_processed_/a/d/csm_26-04-01-Friedemann_Vogel_...	1916 x 492 (3.89)	767 x 322 (2.38)
div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img `div.ut-carousel__item > div.ut-carousel__wrap > picture.ut-picture > img.ut-picture__img`	/fileadmin/_processed_/7/d/csm_Slider_Attempto_Adipositas...	1916 x 492 (3.89)	767 x 322 (2.38)

●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

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

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.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
Slider stoppen/starten `div.ut-text-media > div#carousel537286 > div.ut-carousel__control-bar > a.ut-carousel__play-pause`
Drucken `nav.ut-nav > ul.ut-nav__list > li.ut-nav__item > a.ut-link`

To appear in search results, crawlers need access to your app.

○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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`