Skip to content
https://schalke04.de

Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
SCORE
0
GRADE
FIX
0
REVIEW
0
PASS
0
INFO
0

Detailed Report

Audit breakdown by category with detailed findings.

14

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.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
schalke04.de/content/themes/fcschalke04/assets/js/main.js?17855081873600.0 s223.0 KiB
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-202607293600.0 s212.7 KiB
/content/themes/fcschalke04/assets/css/fcschalke04.css?ve...3600.0 s171.2 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...3600.0 s130.1 KiB
schalke-04-app.firebaseapp.com/__/auth/iframe.js1800.0 s92.6 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...3600.0 s97.1 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...3600.0 s97.0 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...3600.0 s96.2 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...3600.0 s75.7 KiB
/partner/intern/cw_31_2026_atalanta_LB1/img/260617_Schalk...3600.0 s58.1 KiB
/content/themes/fcschalke04/assets/images/logo-veltins.sv...3600.0 s52.6 KiB
/content/themes/fcschalke04/assets/images/logo-veltins-bw...3600.0 s52.4 KiB
/content/themes/fcschalke04/assets/images/logo-veltins-bw...3600.0 s52.4 KiB
schalke04.de/content/themes/fcschalke04/assets/images/membership-banner-bg_m.jpg3600.0 s47.4 KiB
/configs/00002b96-febe6ac7-3aab-3ceb-b0d2-6365f1df7e93/58...180.0 s36.4 KiB
/partner/intern/cw_31_2026_Business_Kreisel_LB2/img/26070...3600.0 s43.2 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/fcs04-icons.svg3600.0 s31.6 KiB
l.ecn-ldr.de/loader/loader.js180.0 s23.5 KiB
schalke04.de/content/global/teams/ksv-hessen-kassel.png3600.0 s21.8 KiB
/partner/intern/cw_31_2026_atalanta_LB1/img/260617_Schalk...3600.0 s21.7 KiB
/content/themes/fcschalke04/assets/js/vendor/requirejs/re...3600.0 s21.7 KiB
/partner/intern/cw_31_2026_Business_Kreisel_LB2/img/26070...3600.0 s20.4 KiB
cdn.jsdelivr.net/npm/hls.js@latest604800.0 s159.9 KiB
l.ecn-ldr.de/core/core.js180.0 s13.5 KiB
/content/themes/fcschalke04/assets/js/vendor/slick-carous...3600.0 s15.2 KiB
app.usercentrics.eu/browser-ui/latest/loader.js3600.0 s10.8 KiB
schalke04.de/content/global/teams/fc-schalke-04.png3600.0 s9.8 KiB
/content/themes/fcschalke04/assets/images/logo-boeklunder...3600.0 s9.8 KiB
/content/themes/fcschalke04/assets/images/logo-boeklunder...3600.0 s9.7 KiB
/content/themes/fcschalke04/assets/images/logo-boeklunder...3600.0 s9.7 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/fcs04-icons.eot3600.0 s9.4 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/fcs04-icons.ttf3600.0 s9.3 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/fcs04-icons.woff3600.0 s9.2 KiB
/content/themes/fcschalke04/assets/fonts/fcs04-icons.woff...3600.0 s9.2 KiB
playout.3qsdn.com/player/css/s04.css3600.0 s8.9 KiB
/content/themes/fcschalke04/assets/images/logo-merkur.png...3600.0 s8.7 KiB
/content/themes/fcschalke04/assets/images/sponsor_logo_he...3600.0 s5.9 KiB
schalke04.de/content/themes/fcschalke04/assets/images/ic_launcher_XXXHDPI.png3600.0 s5.9 KiB
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s11.3 KiB
/SIE/?Q_ZID=ZN_3RbQBel717pvO3I3600.0 s5.1 KiB
/content/themes/fcschalke04/assets/js/modernizr-custom.js...3600.0 s5.0 KiB
/dxjsmodule/941.769e075aa2ef88969a43.chunk.js?Q_CLIENTVER...604800.0 s38.2 KiB
/content/themes/fcschalke04/assets/images/logo-knappschaf...3600.0 s4.6 KiB
/content/themes/fcschalke04/assets/js/vendor/waypoints/li...3600.0 s4.6 KiB
/content/themes/fcschalke04/assets/images/logo-knappschaf...3600.0 s4.3 KiB
/content/themes/fcschalke04/assets/images/logo-merkur_sw....3600.0 s4.3 KiB
/content/themes/fcschalke04/assets/images/logo-knappschaf...3600.0 s4.2 KiB
/content/themes/fcschalke04/assets/images/logo-merkur_sw....3600.0 s4.2 KiB
/content/themes/fcschalke04/assets/images/Footer_Blaklade...3600.0 s4.1 KiB
/content/themes/fcschalke04/assets/images/sponsor_logo_he...3600.0 s4.0 KiB
/content/themes/fcschalke04/assets/images/sponsor_logo_he...3600.0 s4.0 KiB
/content/themes/fcschalke04/assets/images/Footer_Blaklade...3600.0 s4.0 KiB
/content/themes/fcschalke04/assets/images/Footer_Blaklade...3600.0 s4.0 KiB
/content/themes/fcschalke04/assets/images/PERF-11ts-lette...3600.0 s3.4 KiB
schalke04.de/content/themes/fcschalke04/assets/social/style.css?ver=5.9.33600.0 s3.0 KiB
/content/themes/fcschalke04/assets/images/PERF-11ts-lette...3600.0 s2.7 KiB
/content/themes/fcschalke04/assets/images/PERF-11ts-lette...3600.0 s2.7 KiB
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/css/normalize.css3600.0 s2.4 KiB
schalke04.de/content/themes/fcschalke04/assets/images/members/sticker.svg3600.0 s2.3 KiB
/dxjsmodule/881.aef18691518ab4d98fec.chunk.js?Q_CLIENTVER...604800.0 s17.8 KiB
/content/themes/fcschalke04/assets/images/logo-stoelting-...3600.0 s2.2 KiB
/content/themes/fcschalke04/assets/images/logo-stoelting....3600.0 s2.2 KiB
/content/themes/fcschalke04/assets/images/logo-stoelting-...3600.0 s2.2 KiB
schalke04.de/content/themes/fcschalke04/assets/images/Sidebar_User.svg3600.0 s1.8 KiB
/content/themes/fcschalke04/assets/images/Hagedorn_Logo_W...3600.0 s1.8 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/slick.woff3600.0 s1.8 KiB
/content/themes/fcschalke04/assets/images/Hagedorn_Logo_W...3600.0 s1.7 KiB
/content/themes/fcschalke04/assets/images/Footer_Beumer_s...3600.0 s1.6 KiB
/content/themes/fcschalke04/assets/images/Footer_Beumer_R...3600.0 s1.6 KiB
/content/themes/fcschalke04/assets/images/Hagedorn_Logo_W...3600.0 s1.6 KiB
/content/themes/fcschalke04/assets/images/Footer_Beumer_s...3600.0 s1.6 KiB
schalke04.de/content/themes/fcschalke04/assets/js/modules/slider.js?17855081873600.0 s1.5 KiB
schalke04.de/content/themes/fcschalke04/assets/images/Icon_Glueckauf.svg3600.0 s1.4 KiB
schalke04.de/content/themes/fcschalke04/assets/fonts/icomoon/icomoon.ttf?bo59w3600.0 s1.4 KiB
/content/themes/fcschalke04/assets/js/modules/hospitality...3600.0 s1023 B
/content/themes/fcschalke04/assets/js/modules/header-nav....3600.0 s977 B
/content/themes/fcschalke04/assets/images/HRS_BTC_logo_re...3600.0 s977 B
/content/themes/fcschalke04/assets/images/HRS_BTC_logo_bl...3600.0 s941 B
app.usercentrics.eu/session/1px.png?settingsId=ax0_-X4vk1800.0 s821 B
schalke04.de/content/themes/fcschalke04/assets/images/tiktok_icon.svg3600.0 s873 B
/content/themes/fcschalke04/assets/images/HRS_BTC_logo_bl...3600.0 s850 B
schalke04.de/content/themes/fcschalke04/assets/js/modules/scroll.js?17855081873600.0 s799 B
schalke04.de/content/themes/fcschalke04/assets/images/ajax-loader.gif3600.0 s710 B
/content/themes/fcschalke04/assets/js/vendor/conditioner-...3600.0 s681 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/plugins.js3600.0 s669 B
/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/plugin...3600.0 s637 B
schalke04.de/content/themes/fcschalke04/assets/images/flags/4x3/de.svg3600.0 s446 B
/content/themes/fcschalke04/assets/js/modules/marketing.j...3600.0 s381 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/main.js3600.0 s309 B
partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/main.js3600.0 s173 B
/content/themes/fcschalke04/assets/css/fcschalke04.css?ve...3600.0 s0 B
/partner/intern/cw_31_2026_atalanta_LB1/img/260617_Schalk...3600.0 s0 B
/partner/intern/cw_31_2026_Business_Kreisel_LB2/img/26070...3600.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...86400.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/css/normalize.css3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/css/normalize.css3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/plugins.js3600.0 s0 B
/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/plugin...3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/plugins.js3600.0 s0 B
/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/plugin...3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/main.js3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/main.js3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_atalanta_LB1/js/main.js3600.0 s0 B
partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/main.js3600.0 s0 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.

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:0.519163845273626] map[node:map[boundingRect:map[bottom:9386 height:8848 left:0 right:412 top:539 width:412] lhId:page-1-SECTION nodeLabel:Testspiel | Sa. 1.8.26 | 14.00 Uhr Matchcenter Tabelle Tickets Anzeige Newscent… path:3,HTML,2,BODY,6,DIV,0,ARTICLE,6,SECTION selector:body#top > div.site > article.site-wrapper > section.site-main snippet:<section data-memberwall="6" class="site-main "> type:node] score:0.519163845273626]]

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.

URLEst Savings
/content/themes/fcschalke04/assets/fonts/fcs04-icons.woff...25 ms
schalke04.de/content/themes/fcschalke04/assets/fonts/icomoon/icomoon.ttf?bo59w25 ms
schalke04.de/content/themes/fcschalke04/assets/fonts/slick.woff25 ms

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-0-IMG
nodeLabel: 20260731-Muslic
path: 3,HTML,2,BODY,6,DIV,0,ARTICLE,5,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,A,0,DIV,0,IMG
selector: div.stage-element > a > div.stage-media > img.img-fluid
snippet: <img class="img-fluid initial lazyloading" src="https://storage.schalke04.de/sites/1/2026/07/20260731-muslic-768x432.jpg" srcset="https://storage.schalke04.de/sites/1/2026/07/20260731-muslic-375x211.jpg 3…" sizes="(min-width: 1920px) 1280px, (min-width: 1440px) 960px, (min-width: 1200px)…" alt="20260731-Muslic" data-was-processed="true">

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
playout.3qsdn.com/player/css/s04.css8.9 KiB1.0 s
schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.032.0 KiB167 ms
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729212.7 KiB1.2 s
schalke04.de/cms/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.3.24.5 KiB
/content/plugins/wordpress-popular-posts/assets/js/wpp.mi...1.6 KiB
/content/themes/fcschalke04/assets/js/modernizr-custom.js...5.0 KiB
schalke04.de/fast.js?ver=release/1.2.9-202607297.2 KiB
schalke04.de/content/plugins/easy-tables-vc/assets/css/style.css?ver=1.0.0520 B
schalke04.de/content/plugins/easy-tables-vc/assets/css/themes.css?ver=5.9.31.0 KiB
/content/plugins/elasticpress/dist/css/related-posts-bloc...345 B
/content/themes/fcschalke04/assets/css/fcschalke04.css?ve...0 B
/content/plugins/beautiful-taxonomy-filters/public/css/be...475 B
schalke04.de/content/themes/fcschalke04/assets/social/style.css?ver=5.9.33.0 KiB

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
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-768x432.jpg91.6 KiB74.5 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-hd700-768x432.jpg53.6 KiB48.0 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-768x432.jpg54.3 KiB29.3 KiB
230911_Vereinsheim_Kachel_Startseite div.col-xl-8 > a.card-img-top > div.teaser-image > img.img-fluid
/sites/1/2023/09/230911_vereinsheim_kachel_startseite-768...28.6 KiB24.8 KiB
KSV Hessen Kassel div.games-body > div.games-team > div.team-logo > img
schalke04.de/content/global/teams/ksv-hessen-kassel.png21.4 KiB20.6 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.jpg23.5 KiB19.4 KiB
20260731-Samba-HD700 a.teaser-inner-link > div.card-img-top > div.teaser-image > img.img-fluid
storage.schalke04.de/sites/1/2026/07/20260731-samba-hd700-768x432.jpg23.7 KiB15.2 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.jpg18.9 KiB14.8 KiB
20260731-Muslic div.stage-element > a > div.stage-media > img.img-fluid
storage.schalke04.de/sites/1/2026/07/20260731-muslic-768x432.jpg33.5 KiB12.8 KiB
FC Schalke 04 div.games-body > div.games-team > div.team-logo > img
schalke04.de/content/global/teams/fc-schalke-04.png9.5 KiB8.8 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

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
Testspiel | Sa. 1.8.26 | 14.00 Uhr Matchcenter Tabelle Tickets Anzeige Newscent… body#top > div.site > article.site-wrapper > section.site-main
0.519

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

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.3 s 150.8 KiB
URLTransfer SizeEst Savings
schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187222.6 KiB129.9 KiB
/content/themes/fcschalke04/assets/js/vendor/requirejs/re...21.4 KiB15.0 KiB
/content/themes/fcschalke04/assets/js/vendor/slick-carous...15.0 KiB6.0 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 3.3 s 550.6 KiB
URLTransfer SizeEst Savings
cdn.jsdelivr.net/npm/hls.js@latest159.5 KiB145.2 KiB
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729212.4 KiB109.5 KiB
schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187222.6 KiB84.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX175.2 KiB78.7 KiB
app.usercentrics.eu/browser-ui/3.104.0/index.module.js120.6 KiB52.9 KiB
/dxjsmodule/941.769e075aa2ef88969a43.chunk.js?Q_CLIENTVER...38.1 KiB29.4 KiB
app.usercentrics.eu/browser-ui/3.104.0/VirtualServiceItem-21018cfe.js50.3 KiB27.6 KiB
schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.031.7 KiB22.7 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
Unattributable2.0 s191 ms0.0 ms
app.usercentrics.eu/browser-ui/3.104.0/index.module.js1.3 s385 ms2.4 ms
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729897 ms700 ms80 ms
schalke04.de/885 ms165 ms5.5 ms
schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187494 ms100 ms133 ms
www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX416 ms356 ms50 ms
/content/themes/fcschalke04/assets/js/vendor/requirejs/re...349 ms232 ms6.4 ms
/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150...217 ms158 ms0.5 ms
/_/scs/abc-static/_/js/k=gapi.lb.en.9vdPKhB0RUg.O/m=gapi_...97 ms85 ms8.5 ms
schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.085 ms48 ms7.1 ms
/content/themes/fcschalke04/assets/js/modernizr-custom.js...74 ms9.0 ms1.0 ms
/content/themes/fcschalke04/assets/css/fcschalke04.css?ve...65 ms0.0 ms0.0 ms
cdn.jsdelivr.net/npm/hls.js@latest65 ms26 ms39 ms
l.ecn-ldr.de/loader/loader.js58 ms51 ms6.4 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
Other2.8 s
Script Evaluation2.7 s
Style & Layout884 ms
Script Parsing & Compilation390 ms
Parse HTML & CSS237 ms
Garbage Collection189 ms
Rendering78 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
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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187223.0 KiB
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729212.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX175.5 KiB
/content/themes/fcschalke04/assets/css/fcschalke04.css?ve...171.2 KiB
cdn.jsdelivr.net/npm/hls.js@latest159.9 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...130.1 KiB
app.usercentrics.eu/browser-ui/3.104.0/index.module.js120.7 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...97.1 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...97.0 KiB
/content/themes/fcschalke04/assets/fonts/fontawesome-webf...96.2 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Schmuckgrafik Frauen-Trikot div.module > a > figure > img.img-fluid
storage.schalke04.de/sites/1/2026/07/260720_frauen_433x400.jpg
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_877x400-768x350.jpg
Schmuckgrafik Ausweichtrikot div.module > a > figure > img.img-fluid
storage.schalke04.de/sites/1/2026/07/260710_third_877x400-768x350.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...
Logo Beumer Group ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/Footer_Beumer_R...
Logo Adidas | 11Teamsports ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/PERF-11ts-lette...
Logo Veltins ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/logo-veltins.sv...
Logo Stölting Service Group ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/logo-stoelting....
Logo HRS ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/HRS_BTC_logo_re...
Logo Böklunder ul > li > a > img.img-fluid
/content/themes/fcschalke04/assets/images/logo-boeklunder...

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

●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Reduce unused CSS
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 68 animated elements found
●Network Requests
●Network Round Trip Times 70 ms
●Server Backend Latencies 120 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 50 ms
○INP breakdown
○User Timing marks and measures
80

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
1 div.stage-container > div.stage-slider > ul.slick-dots > li#slick-slide10

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

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

Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. Learn more about valid values for ARIA attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
1 div.stage-container > div.stage-slider > ul.slick-dots > li#slick-slide10

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.

Why this matters

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
Sommerferien auf Schalke: Buntes Programm für Knappenkids MITGLIEDER 30.7.… div.module > div.card-deck > div.slick-list > div.slick-track

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.

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
Installieren body#top > div.smartbanner > a.smartbanner__button > span.smartbanner__button__label

These are opportunities to improve the legibility of your content.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.col-xl-24 > div > div.module > iframe#campaign-708011-sm div.col-xl-24 > div > div.module > iframe#campaign-708011-sm
div.col-xl-24 > div > div.module > iframe#campaign-708012-sm div.col-xl-24 > div > div.module > iframe#campaign-708012-sm

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.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Menu div.container-fluid > div.header-top-bar > div.header-mobile-navigation-indicator > button.btn
○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]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●ARIA toggle fields have accessible names
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●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
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Image elements do not have `[alt]` attributes that are redundant text.
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with the `role=text` attribute do not have focusable descendents.
○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
○ARIA IDs are unique
○No form fields have multiple labels
○`<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
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○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.
96

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
schalke04.de/undefined
Failed to load resource: the server responded with a status of 404 ()
/partner/intern/cw_31_2026_Business_Kreisel_LB2/billboard...
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.
/partner/intern/cw_31_2026_Business_Kreisel_LB2/billboard...
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.
/partner/intern/cw_31_2026_Business_Kreisel_LB2/billboard...
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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLMap URL
schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187schalke04.de/content/themes/fcschalke04/assets/js/modal.js.map
l.ecn-ldr.de/loader/loader.jsl.ecn-ldr.de/loader/loader.js.map
l.ecn-ldr.de/core/core.jsl.ecn-ldr.de/core/core.js.map
cdn.jsdelivr.net/npm/hls.js@latestcdn.jsdelivr.net/npm/hls.min.js.map
schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729schalke04.de/firebase/static/js/main.5d403001.js.map
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No 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 clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
100

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.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`
○robots.txt is valid

Send Feedback