Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.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.
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
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.
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.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| /Panopto/Content/Sessions22/e5ea0541-ce4c-4dd4-bb15-af1c0... | 7200.0 s | 785.9 KiB |
| /Panopto/Content/Sessions25/0a83b443-787c-4eed-9961-b0130... | 7200.0 s | 667.3 KiB |
| cdn.embed.ly/player-0.0.10.min.js | 14400.0 s | 4.2 KiB |
| /Panopto/Content/Sessions25/0a83b443-787c-4eed-9961-b0130... | 7200.0 s | 0 B |
| cdn.embed.ly/player-0.0.10.min.js | 14400.0 s | 0 B |
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Eine Wissenschaftlerin und ein Wissenschaftler der JGU bei einer mikroskopische… div.video-canvas > figure.jgu-image > div.jgu-image-wrapper > img | /Panopto/Content/Sessions25/0a83b443-787c-4eed-9961-b0130... | 666.9 KiB | 631.7 KiB |
div.image > figure.jgu-image > div.jgu-image-wrapper > img div.image > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2025/12/startseit... | 568.3 KiB | 463.2 KiB |
Link zur Website der Europäischen Hochschulallianz FORTHEM a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_fort... | 120.7 KiB | 119.2 KiB |
Link zur Website der Mainzer Wissenschaftsallianz a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_main... | 90.8 KiB | 90.5 KiB |
Link zur Website der Rhein-Main-Universitäten a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_rhei... | 19.6 KiB | 19.0 KiB |
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| uni-mainz.de/ | 220 ms |
| www.uni-mainz.de/ | 0.0 ms |
Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| www.uni-mainz.de/ | 815 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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
| 0.664 | |
Johannes Gutenberg Universität Mainz div.main-header > div.container-fluid > div.row > div.brand-wrapper | 0.002 |
div.tb-box-content > a.jgu-teaserbox-content > div.jrc-tc-bottom > i.las div.tb-box-content > a.jgu-teaserbox-content > div.jrc-tc-bottom > i.las | 0.000 |
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.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /wp-content/themes/jgu-theme/dist/main.css?ver=10e130b278... | 45.3 KiB | 39.3 KiB |
| cms-cdn.zdv.uni-mainz.de/css/line-awesome.min.css?ver=1.3.0 | 15.8 KiB | 15.7 KiB |
| www.uni-mainz.de/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4 | 15.6 KiB | 15.4 KiB |
| /* Constants / styles used across the product */ /* Fonts */ /* Sizes */ /* Page gradient */ /* Opa… | 14.6 KiB | 14.6 KiB |
| .break { display: block; height: 15px; } … | 11.6 KiB | 11.6 KiB |
| /* Constants / styles used across the product */ /* Fonts */ /* Sizes */ /* Page gradient */ /* Opa… | 11.1 KiB | 11.1 KiB |
| www.uni-mainz.de/wp-content/plugins/jgu-base/dist/frontend.css?ver=1776761622 | 10.8 KiB | 10.8 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.
Performance issues directly impact user engagement and conversion rates.
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page has an unload handler in a sub frame. | Actionable |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz... | 1.7 MiB | 1.7 MiB |
| /Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz... | 1.7 MiB | 1.7 MiB |
| inline: /* <![CDATA[ */ ( function( domain, tr… | 7.3 KiB | 3.5 KiB |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
Link zur Website der Mainzer Wissenschaftsallianz a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_main... |
Link zur Website der Europäischen Hochschulallianz FORTHEM a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_fort... |
Link zur Website der Rhein-Main-Universitäten a.item > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/logo_rhei... |
Link zur Website der Universitätsallianz U15 a.item > figure.jgu-image > div.jgu-image-wrapper > img | cms.zdv.uni-mainz.de/startseite/wp-content/uploads/sites/31/2023/12/logo_u15.png |
jgu-base-image.align- > figure.jgu-image > div.jgu-image-wrapper > img jgu-base-image.align- > figure.jgu-image > div.jgu-image-wrapper > img | /startseite/wp-content/uploads/sites/31/2023/12/illustrat... |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.contact-col > div.jgu_link > a.jgu_link_inner > span.jgu_button div.contact-col > div.jgu_link > a.jgu_link_inner > span.jgu_button |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div#nuka-carousel > div.nuka-slide-container > div.slider-controls > button.pagination-arrow div#nuka-carousel > div.nuka-slide-container > div.slider-controls > button.pagination-arrow |
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.image > figure.jgu-image > div.jgu-image-wrapper > img div.image > figure.jgu-image > div.jgu-image-wrapper > img |
div.image > figure.jgu-image > div.jgu-image-wrapper > img div.image > figure.jgu-image > div.jgu-image-wrapper > img |
Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.jgu-input-select > div.control > div.value-container > input#react-select-2-input div.jgu-input-select > div.control > div.value-container > input#react-select-2-input |
div.jgu-input-select > div.control > div.value-container > input#react-select-3-input div.jgu-input-select > div.control > div.value-container > input#react-select-3-input |
Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Bachelor of Arts
Bachelor of Arts (Ein-Fach-Bachelor)
Bachelor of Arts (Zwei-Fä… div.fields > div.field > div.jgu_filter_select > select.hide_a11y |
Gesellschafts- und Sozialwissenschaften
Ingenieurwissenschaften
Kunst, Musik, D… div.fields > div.field > div.jgu_filter_select > select.hide_a11y |
weiterführend
grundständig div.fields > div.field > div.jgu_filter_select > select.hide_a11y |
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.
Contrast
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
mehr erfahren div.tb-box-content > a.jgu-teaserbox-content > div.jrc-tc-bottom > span.hover-text |
These are opportunities to improve the legibility of your content.
Best practices
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Campusplan Universität div.jgu_link > a.jgu_link_inner > span.text > a |
Leitbild der JGU ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Leitbild der JGU div.jgu_link > a.jgu_link_inner > span.text > a |
Zahlen & Fakten ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Zahlen & Fakten div.jgu_link > a.jgu_link_inner > span.text > a |
Personensuche ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Personensuche div.jgu_link > a.jgu_link_inner > span.text > a |
Pressemitteilungen ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Pressemitteilungen div.jgu_link > a.jgu_link_inner > span.text > a |
JGU-Magazin ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
JGU-Magazin div.jgu_link > a.jgu_link_inner > span.text > a |
Botanischer Garten ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Botanischer Garten div.jgu_link > a.jgu_link_inner > span.text > a |
Collegium musicum ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Collegium musicum div.jgu_link > a.jgu_link_inner > span.text > a |
Schule des Sehens ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Schule des Sehens div.jgu_link > a.jgu_link_inner > span.text > a |
junior campus mainz ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
junior campus mainz div.jgu_link > a.jgu_link_inner > span.text > a |
Studieren 50 Plus ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Studieren 50 Plus div.jgu_link > a.jgu_link_inner > span.text > a |
Kontakt ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Kontakt div.jgu_link > a.jgu_link_inner > span.text > a |
Impressum ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Impressum div.jgu_link > a.jgu_link_inner > span.text > a |
Datenschutz ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Datenschutz div.jgu_link > a.jgu_link_inner > span.text > a |
Leichte Sprache ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Leichte Sprache div.jgu_link > a.jgu_link_inner > span.text > a |
Barrierefreiheit ul.jgu_links > li > div.jgu_link > a.jgu_link_inner |
Barrierefreiheit div.jgu_link > a.jgu_link_inner > span.text > a |
Johannes Gutenberg-Universität Mainz div.row > div.padding-top > div.jgu_link > a.jgu_link_inner |
Johannes Gutenberg-Universität Mainz div.jgu_link > a.jgu_link_inner > span.text > a |
These items highlight common accessibility best practices.
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| Unload event listeners are deprecated and will be removed. | /Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend... line 24, col 37655 |
| SharedStorage | /Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo... line 9, col 7597 |
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.
Performance issues directly impact user engagement and conversion rates.
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
Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.
Performance issues directly impact user engagement and conversion rates.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.image > figure.jgu-image > div.jgu-image-wrapper > img div.image > figure.jgu-image > div.jgu-image-wrapper > img |
div.image > figure.jgu-image > div.jgu-image-wrapper > img div.image > figure.jgu-image > div.jgu-image-wrapper > img |
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
Performance issues directly impact user engagement and conversion rates.
| Uncrawlable Link |
|---|
Bachelor of Arts div.options-dropdown > ul.options > li > a |
Bachelor of Arts (Ein-Fach-Bachelor) div.options-dropdown > ul.options > li > a |
Bachelor of Arts (Zwei-Fächer-Bachelor) div.options-dropdown > ul.options > li > a |
Bachelor of Education div.options-dropdown > ul.options > li > a |
Bachelor of Laws (Ein-Fach-Bachelor) div.options-dropdown > ul.options > li > a |
Bachelor of Music (Ein-Fach-Bachelor) div.options-dropdown > ul.options > li > a |
Bachelor of Science (Ein-Fach-Bachelor) div.options-dropdown > ul.options > li > a |
Bachelor of Science (in Kombination mit weiterem Schwerpunktfach) div.options-dropdown > ul.options > li > a |
Diplom div.options-dropdown > ul.options > li > a |
Konzertexamen div.options-dropdown > ul.options > li > a |
Lizentiat div.options-dropdown > ul.options > li > a |
Magister Legum div.options-dropdown > ul.options > li > a |
Magister des deutschen und ausländischen Rechts (Magister Iuris) div.options-dropdown > ul.options > li > a |
Magistra/Magister Theologiae div.options-dropdown > ul.options > li > a |
Master of Arts div.options-dropdown > ul.options > li > a |
Master of Business Administration div.options-dropdown > ul.options > li > a |
Master of Education div.options-dropdown > ul.options > li > a |
Master of Laws div.options-dropdown > ul.options > li > a |
Master of Music div.options-dropdown > ul.options > li > a |
Master of Science div.options-dropdown > ul.options > li > a |
Meisterschülerbrief div.options-dropdown > ul.options > li > a |
Staatsexamen div.options-dropdown > ul.options > li > a |
Gesellschafts- und Sozialwissenschaften div.options-dropdown > ul.options > li > a |
Ingenieurwissenschaften div.options-dropdown > ul.options > li > a |
Kunst, Musik, Design div.options-dropdown > ul.options > li > a |
Lehramt div.options-dropdown > ul.options > li > a |
Mathematik, Naturwissenschaften div.options-dropdown > ul.options > li > a |
Medizin, Gesundheitswissenschaften div.options-dropdown > ul.options > li > a |
Sprach- und Kulturwissenschaften div.options-dropdown > ul.options > li > a |
Wirtschaftswissenschaften, Rechtswissenschaften div.options-dropdown > ul.options > li > a |
weiterführend div.options-dropdown > ul.options > li > a |
grundständig div.options-dropdown > ul.options > li > a |
To appear in search results, crawlers need access to your app.