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 |
|---|---|---|
| oc-presentation.elearning.uni-hannover.de/paella7/ui/paella-player.js | 172800.0 s | 362.5 KiB |
| /static/mh_default_org/engage-player/Gmlbz/615fa87a-dfd7-... | 172800.0 s | 141.5 KiB |
| /paella7/ui/default_theme/Roboto-Regular.woff2 | 0.0 ms | 18.8 KiB |
| /paella7/ui/cookie-consent/4.1.0/cookie-consent.js | 172800.0 s | 58.2 KiB |
| oc-presentation.elearning.uni-hannover.de/paella7/ui/default_theme/theme.css | 172800.0 s | 6.0 KiB |
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.
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.
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 | |
|---|---|---|---|
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_357594392bcbac43764e64c... | 315.9 KiB | 287.4 KiB |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_9a06e915320b1fb8879b41c... | 240.0 KiB | 227.8 KiB |
div.column > a.c-card > div.c-card__image-wrap > img div.column > a.c-card > div.c-card__image-wrap > img | /fileadmin/_processed_/8/9/csm_Welfengarten_Sperrung_Lena... | 111.0 KiB | 98.6 KiB |
Screenshot div.column > a.c-card > div.c-card__image-wrap > img | www.uni-hannover.de/fileadmin/_processed_/5/4/csm_fis-portal_b7cb619f40.jpg | 63.2 KiB | 50.8 KiB |
Ein dreigeteiltes Bild zeigt Lehr- und Lernsituationen (links eine Gruppenarbei… a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_f430284cab9c39127d53fad... | 61.7 KiB | 49.4 KiB |
div.column > a.c-card > div.c-card__image-wrap > img div.column > a.c-card > div.c-card__image-wrap > img | /fileadmin/_processed_/8/9/csm_Stadtradeln_Pixabay_jillwe... | 61.0 KiB | 48.6 KiB |
Doktoranden am Institut für Quantenoptik der LUH, bereiten am Lasertisch ein Ex… a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6dfe3988f7045a4f12ee5b2... | 54.6 KiB | 42.2 KiB |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_ef56b3c3056170fc0ed3f4d... | 54.6 KiB | 42.1 KiB |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_1f21f8110fe3a586f9a71ac... | 49.5 KiB | 37.1 KiB |
Hinweis-Schild "Gute Küste Niedersachsen" an einem Deich in Butjadingen div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_9628e56cba815170eff09de... | 62.4 KiB | 33.9 KiB |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_03b113b0b5bfb04619ab205... | 60.4 KiB | 31.9 KiB |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_b434f741b3d88aeb402daa2... | 55.4 KiB | 26.9 KiB |
div.off-canvas-content > div.c-section__introduction > div.c-introduction--gradient > div.c-section--bg-image div.off-canvas-content > div.c-section__introduction > div.c-introduction--gradient > div.c-section--bg-image | www.uni-hannover.de/fileadmin/stagebackgrounds/Strichzeichung_Welfenschloss.png | 44.4 KiB | 26.6 KiB |
Studierende vor einem Computer a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_02dc89f6e37767a76362a3b... | 22.4 KiB | 15.7 KiB |
Hände halten eine Pflanze a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_725ff2edb182f078d828435... | 22.4 KiB | 15.3 KiB |
Website öffnen a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6637f84b61883eac1812bb7... | 16.4 KiB | 11.2 KiB |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_6ed45ffc4b47b6356258b8e... | 35.1 KiB | 9.2 KiB |
Schülerinnen und Schüler erhalten eine Laboreinführung a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6f957aac910aadfa19ca14c... | 14.3 KiB | 7.6 KiB |
Forschende a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_665e723a5e34a7ca97ecf33... | 14.0 KiB | 7.3 KiB |
Bildnis von Leibniz und der Nachbau einer Rechenmaschine a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_d868bff0c34ad298b09c87f... | 13.3 KiB | 6.6 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.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
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-hannover.de/ | 202 ms |
| www.uni-hannover.de/ | 0.0 ms |
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.
Performance issues directly impact user engagement and conversion rates.
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 |
|---|---|---|
| /typo3conf/ext/luh_website/Resources/Public/Build/Css/pag... | 66.1 KiB | 57.4 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.
| URL | Transfer Size | Est Savings |
|---|---|---|
| oc-presentation.elearning.uni-hannover.de/paella7/ui/paella-player.js | 362.2 KiB | 231.3 KiB |
| /typo3conf/ext/luh_website/Resources/Public/Build/JavaScr... | 160.5 KiB | 100.1 KiB |
| /typo3conf/ext/t3luhunisearch/Resources/Public/JavaScript... | 39.3 KiB | 38.8 KiB |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| .player-container { container-type: inline-size; container-name: player-container; } … | 4.9 KiB | 3.5 KiB |
| :root { --video-container-padding: 0px; --video-container-gap: 10px; } … | 3.0 KiB | 2.1 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 | |
|---|---|
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_6ed45ffc4b47b6356258b8e... |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_03b113b0b5bfb04619ab205... |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_b434f741b3d88aeb402daa2... |
Hinweis-Schild "Gute Küste Niedersachsen" an einem Deich in Butjadingen div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_9628e56cba815170eff09de... |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_da7a3bfed4ae81b1a3febc2... |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_ef56b3c3056170fc0ed3f4d... |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_1f21f8110fe3a586f9a71ac... |
Doktoranden am Institut für Quantenoptik der LUH, bereiten am Lasertisch ein Ex… a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6dfe3988f7045a4f12ee5b2... |
Website öffnen a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6637f84b61883eac1812bb7... |
Hände halten eine Pflanze a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_725ff2edb182f078d828435... |
Slider Image div.c-introduction-element__image-container > a > div.c-introduction-element__image > img | /typo3temp/lf_vhs_direct/fpdirect_357594392bcbac43764e64c... |
Bild a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_9a06e915320b1fb8879b41c... |
Ein dreigeteiltes Bild zeigt Lehr- und Lernsituationen (links eine Gruppenarbei… a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_f430284cab9c39127d53fad... |
Forschende a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_665e723a5e34a7ca97ecf33... |
Studierende vor einem Computer a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_02dc89f6e37767a76362a3b... |
Bildnis von Leibniz und der Nachbau einer Rechenmaschine a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_d868bff0c34ad298b09c87f... |
Schülerinnen und Schüler erhalten eine Laboreinführung a.c-card > div.c-card__image-wrap > div > img | /typo3temp/lf_vhs_direct/fpdirect_6f957aac910aadfa19ca14c... |
Logo Leibniz Universität Hannover div.c-header > div.c-header__content > a.c-logo > img.c-logo__image | /typo3conf/ext/luh_website/Resources/Public/Images/Logo/l... |
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
Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
English div.o-brand--gradient > div.row > div.columns > a.show-for-medium |
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.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot div.c-introduction--gradient > div.c-introduction-slider__controls > div#dots > button.dot |
Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
figure.c-figure > div.flex-video > div.embed-responsive > iframe.embed-responsive-item figure.c-figure > div.flex-video > div.embed-responsive > iframe.embed-responsive-item |
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.
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 |
|---|
div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__prev div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__prev |
div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__status div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__status |
div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__next div.c-introduction--gradient > div.c-introduction-slider__controls > div.c-introduction-slider__navigation > button.c-introduction-slider__next |
These items highlight common accessibility best practices.
Best Practices
General
Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
Failed to load resource: the server responded with a status of 404 () |
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.
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 |
|---|
li.offcanvas-menu__item > ul.menu > li.js-drilldown-back > a li.offcanvas-menu__item > ul.menu > li.js-drilldown-back > a |
To appear in search results, crawlers need access to your app.