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.
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.
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.
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 | |
|---|---|---|---|
Schmuckgrafik Ausweichtrikot div.module > a > figure > img.img-fluid | storage.schalke04.de/sites/1/2026/07/260710_third_877x400.jpg | 113.9 KiB | 67.6 KiB |
260511_Keyvisual_SGU_HomepageBG div.stage-element > a > div.stage-media > img.img-fluid | storage.schalke04.de/sites/1/2026/05/260511_keyvisual_sgu_homepagebg-992x558.jpg | 104.3 KiB | 49.0 KiB |
Werbebanner S04 TV+: ‚Hier läuft Schalke. Jetzt abonnieren!‘; Jubelszene in Bla… div.module > a > figure > img.img-fluid | storage.schalke04.de/sites/1/2026/07/s04tvplus_motiv2_877x400.jpg | 81.9 KiB | 24.8 KiB |
KSV Hessen Kassel div.games-body > div.games-team > div.team-logo > img | schalke04.de/content/global/teams/ksv-hessen-kassel.png | 21.4 KiB | 19.2 KiB |
260731_VELTINS-Arena-Panorama a.teaser-inner-link > div.card-img-top > div.teaser-image > img.img-fluid | storage.schalke04.de/sites/1/2026/07/260731_veltins-arena-panorama-375x211.jpg | 23.5 KiB | 19.1 KiB |
260730_Kassel_Stadion a.teaser-inner-link > div.card-img-top > div.teaser-image > img.img-fluid | storage.schalke04.de/sites/1/2026/07/260730_kassel_stadion-375x211.jpg | 25.7 KiB | 14.4 KiB |
20260717-Heimtrikot-HD700 div.col-xl-8 > a.card-img-top > div.teaser-image > img.img-fluid | storage.schalke04.de/sites/1/2026/07/20260717-heimtrikot-hd700-576x324.jpg | 32.9 KiB | 11.9 KiB |
FC Schalke 04 div.games-body > div.games-team > div.team-logo > img | schalke04.de/content/global/teams/fc-schalke-04.png | 9.5 KiB | 7.8 KiB |
20260728-S04RealHD700 a.teaser-inner-link > div.card-img-top > div.teaser-image > img.img-fluid | storage.schalke04.de/sites/1/2026/07/20260728-s04realhd700-375x211.jpg | 18.9 KiB | 7.5 KiB |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Diagnostics
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 |
|---|---|---|
| cdn.jsdelivr.net/npm/hls.js@latest | 159.5 KiB | 145.2 KiB |
| schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729 | 212.6 KiB | 110.7 KiB |
| schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187 | 222.6 KiB | 84.5 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 175.2 KiB | 77.6 KiB |
| app.usercentrics.eu/browser-ui/3.104.0/index.module.js | 120.6 KiB | 52.9 KiB |
| /dxjsmodule/941.769e075aa2ef88969a43.chunk.js?Q_CLIENTVER... | 38.1 KiB | 29.4 KiB |
| app.usercentrics.eu/browser-ui/3.104.0/VirtualServiceItem-21018cfe.js | 50.3 KiB | 27.7 KiB |
| schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.0 | 31.7 KiB | 22.7 KiB |
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 |
|---|---|
| Pages whose main resource has cache-control:no-store cannot enter back/forward cache. | Not actionable |
| Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header. | Not actionable |
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 |
|---|---|---|
| schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187 | 222.6 KiB | 129.9 KiB |
| /content/themes/fcschalke04/assets/js/vendor/requirejs/re... | 21.3 KiB | 14.9 KiB |
| /content/themes/fcschalke04/assets/js/vendor/slick-carous... | 15.0 KiB | 6.0 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.
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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Other | 1.2 s |
| Script Evaluation | 678 ms |
| Style & Layout | 372 ms |
| Script Parsing & Compilation | 92 ms |
| Rendering | 86 ms |
| Parse HTML & CSS | 72 ms |
| Garbage Collection | 51 ms |
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 | |
|---|---|
Werbebanner S04 TV+: ‚Hier läuft Schalke. Jetzt abonnieren!‘; Jubelszene in Bla… div.module > a > figure > img.img-fluid | storage.schalke04.de/sites/1/2026/07/s04tvplus_motiv2_877x400.jpg |
Schmuckgrafik Ausweichtrikot div.module > a > figure > img.img-fluid | storage.schalke04.de/sites/1/2026/07/260710_third_877x400.jpg |
Schmuckgrafik Frauen-Trikot div.module > a > figure > img.img-fluid | storage.schalke04.de/sites/1/2026/07/260720_frauen_433x400.jpg |
Logo Knappschaft Kliniken ul > li > a > img.img-fluid | /content/themes/fcschalke04/assets/images/logo-knappschaf... |
Logo Hegmanns Gruppe ul > li > a > img.img-fluid | /content/themes/fcschalke04/assets/images/sponsor_logo_he... |
Logo Merkur ul > li > a > img.img-fluid | /content/themes/fcschalke04/assets/images/logo-merkur.png... |
Logo Blåkläder ul > li > a > img.img-fluid | /content/themes/fcschalke04/assets/images/Footer_Blaklade... |
Logo Hagedorn ul > li > a > img.img-fluid | /content/themes/fcschalke04/assets/images/Hagedorn_Logo_W... |
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 |
|---|
4 div.stage-container > div.stage-slider > ul.slick-dots > li#slick-slide13 |
Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
1
2
3
4
5 div.col-xl-16 > div.stage-container > div.stage-slider > ul.slick-dots |
When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Aus vielen Anteilen wird gemeinsame Stärke: Jetzt Anteile an der Auf Schalke eG… div.stage-container > div.stage-slider > div.slick-list > div.slick-track |
Fußballfest gegen Real Madrid: Wenige Kontingente in den VIP-Bereichen erhältli… div.module > div.card-deck > div.slick-list > div.slick-track |
Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Suche umschalten div.header-nav > div.nav-meta > div.meta-search > div.btn |
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
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 |
|---|
div.col-xl-24 > div > div.module > iframe#campaign-708011-lg div.col-xl-24 > div > div.module > iframe#campaign-708011-lg |
div.col-xl-24 > div > div.module > iframe#campaign-708012-lg div.col-xl-24 > div > div.module > iframe#campaign-708012-lg |
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
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 () | |
Refused to apply style from 'https://partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/css/normalize.css' because its MIME type ('application/xml') is not a supported stylesheet MIME type, and strict MIME checking is enabled. | |
Refused to apply style from 'https://partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/css/normalize.css' because its MIME type ('application/xml') is not a supported stylesheet MIME type, and strict MIME checking is enabled. | |
Refused to apply style from 'https://partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/css/normalize.css' because its MIME type ('application/xml') is not a supported stylesheet MIME type, and strict MIME checking is enabled. |
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.