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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.

6

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.

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:1.1427770000000002] map[score:0.658803 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://cms-cdn.zdv.uni-mainz.de/fonts/NotoSans-SemiCondensed-Medium-subset.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:429 height:329 left:0 right:412 top:100 width:412] lhId:page-13-DIV nodeLabel:Foto: Alexander Griesser path:1,HTML,1,BODY,1,DIV,0,DIV,0,MAIN,0,JGU-BASE-PAGEHEADER,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV selector:div.row > div.image-col > div.image > div.jgu_video snippet:<div class="jgu_video"> type:node] score:0.343855] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-10-DIV nodeLabel: Mit ihrer Schwerpunktbildung in der Forschung erfüllt die Johannes Gutenberg-… path:0,DIV,1,DIV selector:div.jgu-bgsection > div.content > div.wp-block-columns snippet:<div class="wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595…"> type:node] score:0.099495] map[node:map[boundingRect:map[bottom:4518 height:4418 left:10 right:402 top:100 width:391] lhId:page-9-DIV nodeLabel:Foto: Alexander Griesser Forschungsprofil Internationale Spitzenforschung an d… path:1,HTML,1,BODY,1,DIV selector:body.home > div.wrap snippet:<div class="wrap container-fluid page" role="document"> type:node] score:0.040624]]

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.

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
Über dieses Foto gelangt man zu einem Image-Video der JGU, das Bilder aus der U… div.video-canvas > figure.jgu-image > div.jgu-image-wrapper > img
/startseite/wp-content/uploads/sites/31/2024/01/startseit...1022.2 KiB925.7 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/31/2026/02/Eingangsb...775.0 KiB678.6 KiB
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 KiB633.5 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/31/2025/06/startseit...577.8 KiB481.3 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 KiB471.9 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/31/2026/04/09_chemie...385.3 KiB288.9 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 KiB116.0 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 KiB89.8 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 KiB17.9 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: Eine Wissenschaftlerin und ein Wissenschaftler der JGU bei einer mikroskopische…
path: 1,HTML,1,BODY,1,DIV,0,DIV,0,MAIN,0,JGU-BASE-PAGEHEADER,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,FIGURE,0,DIV,0,IMG
selector: div.video-canvas > figure.jgu-image > div.jgu-image-wrapper > img
snippet: <img src="https://panopto-cache.zdv.net/Panopto/Content/Sessions25/0a83b443-787c-4ee…" alt="Eine Wissenschaftlerin und ein Wissenschaftler der JGU bei einer mikroskop…" loading="lazy">

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
cms-cdn.zdv.uni-mainz.de/css/line-awesome.min.css?ver=6.9.415.8 KiB317 ms
www.uni-mainz.de/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f247.3 KiB
cms-cdn.zdv.uni-mainz.de/css/line-awesome.min.css?ver=1.3.016.4 KiB948 ms
/wp-content/plugins/jgu-base/dist/frontend.js?ver=2655bff...280.0 KiB
www.uni-mainz.de/wp-includes/js/dist/date.min.js?ver=795a56839718d3ff7eae42.5 KiB317 ms
www.uni-mainz.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.141.0 KiB159 ms
www.uni-mainz.de/wp-includes/js/dist/rich-text.min.js?ver=5bdbb44f3039529e364512.1 KiB
/wp-content/plugins/jgu-study-finder/dist/frontend.js?ver...8.9 KiB
www.uni-mainz.de/wp-includes/js/dist/data.min.js?ver=f940198280891b0b63188.7 KiB
/wp-includes/js/dist/private-apis.min.js?ver=4f465748bda6...1.1 KiB
www.uni-mainz.de/wp-includes/js/dist/compose.min.js?ver=7a9b375d8c19cf9d3d9b12.5 KiB159 ms
/wp-content/plugins/jgu-navigation-structure/dist/fronten...59 B
/wp-includes/js/dist/redux-routine.min.js?ver=8bb92d45458...2.8 KiB
www.uni-mainz.de/wp-includes/js/dist/warning.min.js?ver=d69bc18c456d01c11d5a303 B
www.uni-mainz.de/wp-includes/js/dist/primitives.min.js?ver=0b5dcc337aa7cbf75570897 B
/wp-includes/js/dist/html-entities.min.js?ver=e8b78b18a16...511 B
www.uni-mainz.de/wp-includes/js/dist/keycodes.min.js?ver=34c8fb5e7a594a1c80371.4 KiB
/wp-includes/js/dist/priority-queue.min.js?ver=2d59d09122...1.6 KiB
www.uni-mainz.de/wp-includes/js/dist/element.min.js?ver=6a582b0c827fa25df3dd4.9 KiB
/wp-includes/js/dist/is-shallow-equal.min.js?ver=e0f9f1d7...583 B
www.uni-mainz.de/wp-includes/js/dist/dom.min.js?ver=26edef3be6483da3de2e4.7 KiB
www.uni-mainz.de/wp-includes/js/dist/escape-html.min.js?ver=6561a406d2d232a6fbd2596 B
www.uni-mainz.de/wp-includes/js/dist/deprecated.min.js?ver=e1f84915c5e8ae38964c509 B
/startseite/wp-content/plugins/jgu-fis/dist/scripts/front...392 B
/startseite/wp-content/plugins/jgu-tools/dist/scripts/fro...392 B
/startseite/wp-content/plugins/jgu-fis/dist/styles/blocks...60 B802 ms
/startseite/wp-content/plugins/jgu-jogustine/dist/scripts...409 B
/startseite/wp-content/plugins/jgu-jogustine/dist/styles/...60 B158 ms
/startseite/wp-content/plugins/jgu-fis/dist/styles/fronte...187 B
/startseite/wp-content/plugins/sitepress-multilingual-cms...402 B
/startseite/wp-content/plugins/jgu-jogustine/dist/styles/...126 B
/startseite/wp-content/plugins/jgu-tools/dist/styles/fron...884 B
/wp-content/themes/jgu-theme/dist/main.css?ver=10e130b278...45.4 KiB793 ms
www.uni-mainz.de/wp-includes/js/jquery/jquery.min.js?ver=3.7.129.8 KiB159 ms
www.uni-mainz.de/wp-includes/js/dist/a11y.min.js?ver=cb460b4676c94bd228ed993 B
www.uni-mainz.de/wp-includes/js/dist/vendor/moment.min.js?ver=2.30.118.4 KiB159 ms
www.uni-mainz.de/wp-includes/js/dist/autop.min.js?ver=9fb50649848277dd318d2.1 KiB
www.uni-mainz.de/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.14.8 KiB
www.uni-mainz.de/wp-content/plugins/jgu-base/dist/frontend.css?ver=177676162910.9 KiB159 ms
www.uni-mainz.de/wp-includes/js/dist/url.min.js?ver=9e178c9516d1222dc8343.8 KiB
www.uni-mainz.de/wp-includes/js/dist/dom-ready.min.js?ver=f77871ff7694fffea381406 B
www.uni-mainz.de/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933752.2 KiB159 ms
www.uni-mainz.de/wp-includes/js/dist/api-fetch.min.js?ver=3a4d9af2b423048b0dee2.4 KiB
www.uni-mainz.de/wp-includes/css/dist/block-library/style.min.css?ver=6.9.415.6 KiB317 ms
www.uni-mainz.de/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f12.0 KiB
www.uni-mainz.de/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.14.2 KiB
www.uni-mainz.de/wp-includes/js/dist/vendor/react-jsx-runtime.min.js?ver=18.3.1618 B
/wp-content/plugins/jgu-navigation-structure/dist/fronten...86 B
/wp-content/plugins/jgu-study-finder/dist/frontend.css?ve...163 B

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: 776 ms
URLTime Spent
uni-mainz.de/776 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 639 ms
URLTime Spent
www.uni-mainz.de/739 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
0.659
Foto: Alexander Griesser div.row > div.image-col > div.image > div.jgu_video
0.344
Mit ihrer Schwerpunktbildung in der Forschung erfüllt die Johannes Gutenberg-… div.jgu-bgsection > div.content > div.wp-block-columns
0.099
Foto: Alexander Griesser Forschungsprofil Internationale Spitzenforschung an d… body.home > div.wrap
0.041

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.

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: 4.2 s 4.7 MiB
URLTransfer SizeEst Savings
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/comm...406.6 KiB344.2 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/comm...406.6 KiB344.2 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/comm...406.6 KiB342.8 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/comm...406.6 KiB342.8 KiB
www.uni-mainz.de/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f247.1 KiB198.6 KiB
/wp-content/plugins/jgu-base/dist/frontend.js?ver=2655bff...279.5 KiB167.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/reac...277.5 KiB163.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/reac...277.5 KiB163.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/reac...277.5 KiB163.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/reac...277.5 KiB163.0 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Core.js206.7 KiB142.2 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Core.js206.7 KiB142.2 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Core.js206.7 KiB142.2 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Core.js206.7 KiB142.2 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/HlsJs/stable/hls.min.js121.9 KiB107.0 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/HlsJs/stable/hls.min.js121.9 KiB107.0 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/HlsJs/stable/hls.min.js121.9 KiB107.0 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/HlsJs/stable/hls.min.js121.9 KiB107.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend...214.9 KiB87.4 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend...214.9 KiB87.4 KiB
/wp-content/themes/jgu-theme/dist/main.js?ver=10e130b278b...152.7 KiB85.4 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend...214.9 KiB84.7 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend...214.9 KiB84.7 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/view...352.7 KiB71.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/view...352.7 KiB71.0 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/view...352.7 KiB70.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/view...352.7 KiB70.1 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/jQuery/jquery-ui.min.js51.6 KiB45.6 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/jQuery/jquery-ui.min.js51.6 KiB45.6 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/jQuery/jquery-ui.min.js51.6 KiB45.6 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/jQuery/jquery-ui.min.js51.6 KiB45.6 KiB
/Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo...67.9 KiB45.6 KiB
/Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo...67.9 KiB45.6 KiB
/Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo...67.9 KiB45.6 KiB
/Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo...67.9 KiB45.6 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz...1.7 MiB25.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz...1.7 MiB25.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz...1.7 MiB25.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz...1.7 MiB25.1 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Embed.js41.4 KiB22.3 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Embed.js41.4 KiB22.3 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Even...40.5 KiB22.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Even...40.5 KiB22.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Even...40.5 KiB22.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Even...40.5 KiB22.1 KiB
/Panopto/Cache/13.20.3.01092/Scripts/MicrosoftAjax/Micros...33.6 KiB21.9 KiB
/Panopto/Cache/13.20.3.01092/Scripts/MicrosoftAjax/Micros...33.6 KiB21.9 KiB
/Panopto/Cache/13.20.3.01092/Scripts/MicrosoftAjax/Micros...33.6 KiB21.9 KiB
/Panopto/Cache/13.20.3.01092/Scripts/MicrosoftAjax/Micros...33.6 KiB21.9 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Embed.js41.4 KiB21.7 KiB
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Embed.js41.4 KiB21.7 KiB
www.uni-mainz.de/wp-includes/js/jquery/jquery.min.js?ver=3.7.129.7 KiB21.5 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
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/quiz...2.4 s205 ms1.9 s
Unattributable2.3 s92 ms0.0 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/reac...1.6 s1.2 s281 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/view...1.3 s1.1 s204 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/vend...991 ms652 ms235 ms
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Core.js792 ms490 ms298 ms
www.uni-mainz.de/747 ms30 ms25 ms
www.uni-mainz.de/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.1721 ms493 ms1.1 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/comm...682 ms144 ms534 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Even...475 ms437 ms35 ms
/wp-content/plugins/jgu-base/dist/frontend.js?ver=2655bff...357 ms198 ms69 ms
/Panopto/Cache/13.20.3.01092/Scripts/FlowPlayer/7.2.7/flo...231 ms175 ms55 ms
/Panopto/ScriptResource.axd?d=2Q8gDeugccF20Q3QNV4Z-oWkyeX...227 ms18 ms207 ms
/Panopto/Pages/Embed.aspx?id=7866e8c4-66de-457c-bb4a-b013...226 ms89 ms60 ms
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/HlsJs/stable/hls.min.js204 ms102 ms101 ms
/Panopto/Pages/Embed.aspx?id=b6cfaf8e-a98d-42fc-a44a-af1c...179 ms83 ms16 ms
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/jQuery/jquery-ui.min.js142 ms77 ms55 ms
/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/core...136 ms99 ms34 ms
/wp-content/themes/jgu-theme/dist/main.js?ver=10e130b278b...125 ms64 ms34 ms
www.uni-mainz.de/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f123 ms61 ms61 ms
www.uni-mainz.de/wp-includes/js/dist/date.min.js?ver=795a56839718d3ff7eae115 ms40 ms74 ms
/Panopto/Cache/13.20.3.01092/Scripts/MicrosoftAjax/Micros...106 ms76 ms30 ms
video.uni-mainz.de/Panopto/Cache/13.20.3.01092/Scripts/Panopto/Bundles/Embed.js105 ms50 ms44 ms
www.uni-mainz.de/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.155 ms35 ms12 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 Evaluation6.1 s
Script Parsing & Compilation4.5 s
Other2.9 s
Style & Layout685 ms
Parse HTML & CSS351 ms
Rendering107 ms
Garbage Collection82 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
The page has an unload handler in a sub frame.Actionable

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.

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
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.

Optimize DOM size
Forced reflow
LCP breakdown
Modern HTTP
Optimize viewport for mobile
Avoid long main-thread tasks 20 long tasks found
Network Requests
Network Round Trip Times 30 ms
Server Backend Latencies 400 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
INP breakdown
User Timing marks and measures
Avoid non-composited animations
68

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
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.

Why this matters

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
dialog.jgu-filter-mobile-modal > form#jgu_filter_form > div.fields > button.jgu-btn dialog.jgu-filter-mobile-modal > form#jgu_filter_form > div.fields > button.jgu-btn
dialog.jgu-filter-mobile-modal > form#jgu_filter_form > div.fields > button.jgu-btn dialog.jgu-filter-mobile-modal > form#jgu_filter_form > div.fields > button.jgu-btn

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.

Why this matters

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.

Why this matters

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.

Why this matters

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
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.

Why this matters

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.

Why this matters

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.

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
`[role]` values are valid
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
`[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
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
Heading elements appear in a sequentially-descending order
Document has a main landmark.
Deprecated ARIA roles were not used
ARIA IDs are unique
No form fields have multiple labels
`[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
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
`<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
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.
Identical links have the same purpose.
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.
81

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Unload event listeners are deprecated and will be removed.
SharedStorage

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.

URLMap URL
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www.uni-mainz.de/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f
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Uses HTTPS
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
Redirects HTTP traffic to HTTPS
Mitigate clickjacking with XFO or CSP
77

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.

Why this matters

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.

Why this matters

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

Why this matters

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
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.

Structured data is valid
Page isn’t blocked from indexing
Document has a `<title>` element
Page has successful HTTP status code
Links have descriptive text
robots.txt is valid
Document has a valid `hreflang`
Document has a valid `rel=canonical`

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