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.

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.

URL	Est Savings
/_assets/a92153751098915699a1afa17e77f864/Fonts/FiraSans-...	1.7 s
/_assets/a92153751098915699a1afa17e77f864/Fonts/FiraSans-...	1.7 s
/_assets/a92153751098915699a1afa17e77f864/Fonts/FiraSans-...	1.7 s
/_assets/a92153751098915699a1afa17e77f864/Fonts/FiraSans-...	1.7 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.

	URL	Resource Size	Est Savings
Luftaufnahme der Wissenschaftsstadt Ulm mit Campus und Forschungsgebäuden `div.row > div.col > div#card1043012 > img.card-img-top`	www.uni-ulm.de/fileadmin/website_uni_ulm/home/UEber_uns/Uni_Ulm_Science_City.jpg	972.3 KiB	929.2 KiB
div.carousel-inner > div.carousel-item > a > img.d-block `div.carousel-inner > div.carousel-item > a > img.d-block`	www.uni-ulm.de/fileadmin/img/slider/Slider_2026/Semestereroeffnung.jpg	362.3 KiB	305.9 KiB
Studierende untersuchen Blumen auf einer Wiese `div.row > div#collapse1043044 > figure.figure-with-spacing > img.d-block`	www.uni-ulm.de/fileadmin/website_uni_ulm/home/UEber_uns/biologie_Studenten1.jpg	344.6 KiB	293.6 KiB
Studierende sitzen im Hörsaal `div.row > div.col > div#card1043011 > img.card-img-top`	/fileadmin/website_uni_ulm/home/UEber_uns/studenten_hoers...	317.5 KiB	274.4 KiB
Studierende laufen den Treppenstieg am Eingang Süd der Universität hinunter. `div.row > div#collapse1043040 > figure.figure-with-spacing > img.d-block`	www.uni-ulm.de/fileadmin/_processed_/1/9/csm_Img_128a_7bf797fa38.jpg	282.8 KiB	226.0 KiB
Vorbereitung eines Experiments in der Quantenoptik `div.row > div.col > div#card1043020 > img.card-img-top`	/fileadmin/website_uni_ulm/forschung/Exzellenz/Quantenopt...	195.1 KiB	170.4 KiB
Vorbereitung eines Experiments am Institut für Quantenoptik `div.row > div.col > div#card1043010 > img.card-img-top`	/fileadmin/website_uni_ulm/home/UEber_uns/Quantenoptik_00...	175.7 KiB	132.7 KiB
Forschung zur innovativen Gewinnung von grünem Wasserstoff `div.row > div.col > div#card1043021 > img.card-img-top`	/fileadmin/website_uni_ulm/forschung/Exzellenz/rau_sven_2...	89.5 KiB	78.0 KiB
Prof. Michael Weber, Präsident `div.row > div#collapse1043017 > figure.figure-with-spacing > img.d-block`	www.uni-ulm.de/fileadmin/_processed_/8/6/csm_weber_michael_2021_5_d00d7f5b4f.jpg	109.0 KiB	67.8 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:1291.376 label:Time to first byte subpart:timeToFirstByte] map[duration:3130.011 label:Element render delay subpart:elementRenderDelay]]

lhId: page-9-P

nodeLabel: In unserem Onlineangebot sind Daten und Dienstleistungen von Fremdanbietern int…

path: 1,HTML,1,BODY,8,DIV,0,DIV,0,DIV,1,P

selector: div.in2-modal__blackbox > div.in2-modal > div.in2-modal-container > p.in2-modal-paragraph

snippet: <p class="in2-modal-paragraph">

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
/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic....	3.3 KiB
/typo3temp/assets/compressed/style-3f19830b8872601e318a6e...	4.3 KiB
/typo3temp/assets/compressed/ods_osm-2a3f1cd3eddbd6602889...	504 B
/typo3temp/assets/compressed/academicons-778195a43ecae331...	1.5 KiB
/typo3temp/assets/compressed/fontawesome-43e1c3ac65e8eb0f...	11.9 KiB	150 ms
/typo3temp/assets/compressed/basic-c96adb4833f6e6e3db4efc...	57.7 KiB	300 ms

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
webanalyse.uni-ulm.de/matomo.js	0.0 ms	21.0 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

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: 750 ms

URL	Time Spent
uni-ulm.de/	750 ms
www.uni-ulm.de/	0.0 ms

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 300 ms 59.0 KiB

URL	Transfer Size	Est Savings
/_assets/a92153751098915699a1afa17e77f864/JavaScripts/Ven...	84.5 KiB	59.0 KiB

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: 450 ms 66.2 KiB

URL	Transfer Size	Est Savings
/typo3temp/assets/compressed/basic-c96adb4833f6e6e3db4efc...	57.6 KiB	54.4 KiB
/typo3temp/assets/compressed/fontawesome-43e1c3ac65e8eb0f...	11.8 KiB	11.8 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: 1.8 s 335.1 KiB

URL	Transfer Size	Est Savings
/_assets/a92153751098915699a1afa17e77f864/JavaScripts/mai...	423.1 KiB	305.9 KiB
/_assets/a92153751098915699a1afa17e77f864/JavaScripts/011...	63.0 KiB	29.3 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Other	797 ms
Style & Layout	458 ms
Script Evaluation	455 ms
Rendering	154 ms
Script Parsing & Compilation	129 ms
Parse HTML & CSS	84 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
www.uni-ulm.de/fileadmin/website_uni_ulm/home/UEber_uns/Uni_Ulm_Science_City.jpg	972.9 KiB
/fileadmin/img/slider/Slider_2026/Intensiv_geduengtes_Gru...	781.9 KiB
/_assets/a92153751098915699a1afa17e77f864/JavaScripts/mai...	423.8 KiB
/fileadmin/website_uni_ulm/wissen_anwenden/Skills_Lab_Arb...	422.3 KiB
www.uni-ulm.de/fileadmin/img/slider/Slider_2026/Semestereroeffnung.jpg	362.6 KiB
www.uni-ulm.de/fileadmin/website_uni_ulm/home/UEber_uns/biologie_Studenten1.jpg	344.8 KiB
/fileadmin/img/slider/Slider_2026/SleepLoop_Schlafstimula...	325.8 KiB
/fileadmin/website_uni_ulm/home/UEber_uns/studenten_hoers...	317.7 KiB
www.uni-ulm.de/fileadmin/_processed_/1/9/csm_Img_128a_7bf797fa38.jpg	283.0 KiB
/typo3temp/assets/compressed/merged-272f9772ac9f3572a81a9...	258.7 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
bluesky `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--bluesky`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/bl...
Logo: StudyCheck - digital readiness `div.row > div.col-lg-2 > a.showcase__link > img.showcase__award`	/_assets/a92153751098915699a1afa17e77f864/Images/Siegel-d...
Logo: Zertifikat seit 2008 – Audit familiengerechte Hochschule `div.row > div.col-lg-2 > a.showcase__link > img.showcase__award`	/_assets/a92153751098915699a1afa17e77f864/Images/logo_fam...
Logo: StudyCheck - Top Universität `div.row > div.col-lg-2 > a.showcase__link > img.showcase__award`	/_assets/a92153751098915699a1afa17e77f864/Images/top-univ...
Logo: Weltoffene Hochschulen – Gegen Fremdenfeindlichkeit `div.row > div.col-lg-2 > a.showcase__link > img.showcase__award`	/_assets/a92153751098915699a1afa17e77f864/Images/logo-wel...
Logo der Universität Ulm `div.col > div.logo > a.logo__link > img.logo__img`	/_assets/a92153751098915699a1afa17e77f864/Images/logo-uni...
instagram `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--instagram`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/in...
facebook `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--facebook`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/fa...
linkedin `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--linkedin`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/li...
mastodon `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--mastodon`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/ma...
youtube `li.footer-navigation__item > div.footer-socialicons > a.footer-socialicon > img.footer-socialicon--youtube`	/_assets/a92153751098915699a1afa17e77f864/Images/Icons/yo...

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

●Max Potential First Input Delay 130 ms

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●JavaScript execution time 0.5 s

●Avoid long main-thread tasks 5 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 1,090 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 160 ms

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Alle Cookies akzeptieren `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
oder `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > p.in2-modal-divider`
Auswahl speichern & schließen `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
oder `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > p.in2-modal-divider`
Nur notwendige Cookies `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`

These are opportunities to improve the legibility of your content.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.row > div#collapse1043053 > figure.figure-with-spacing > a `div.row > div#collapse1043053 > figure.figure-with-spacing > a`

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`
div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-chatbot `div.in2-modal > div.in2-modal-flexline > div.in2-modal-reset > input#in2-modal-checkbox-chatbot`
Alle Cookies akzeptieren `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
Auswahl speichern & schließen `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
Nur notwendige Cookies `div.in2-modal__blackbox > div.in2-modal > div.in2-modal-spacing > button.in2-modal-reset`
Notwendige Cookies `div.in2-modal__blackbox > div.in2-modal > dl.in2-modal-accordion > dt.in2-modal-accordion__title`
Externe Video Inhalte `div.in2-modal__blackbox > div.in2-modal > dl.in2-modal-accordion > dt.in2-modal-accordion__title`
Chatbot Assistent `div.in2-modal__blackbox > div.in2-modal > dl.in2-modal-accordion > dt.in2-modal-accordion__title`

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

●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

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

●Elements use only permitted ARIA attributes

●`<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

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○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

○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.

○`[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.

100

Best Practices

●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 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.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.uni-ulm.de/studium/bewerbung-und-immatrikulation/mehr/	Mehr
www.uni-ulm.de/studium/studienorganisation/mehr/	Mehr

Format your HTML in a way that enables crawlers to better understand your app’s content.

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 anhalten/starten `div#c621050 > div#carousel621050 > div.carousel-indicators > a.carousel__play-pause`
div.lb-outerContainer > div.lb-container > div.lb-loader > a.lb-cancel `div.lb-outerContainer > div.lb-container > div.lb-loader > a.lb-cancel`
div.lb-dataContainer > div.lb-data > div.lb-closeContainer > a.lb-close `div.lb-dataContainer > div.lb-data > div.lb-closeContainer > a.lb-close`

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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`