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· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

60

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
assets.poool.fr/advanced-paywall-frame.min.js1800.0 s157.1 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js86400.0 s131.0 KiB
assets.poool.fr/access.min.js1800.0 s31.3 KiB
assets.poool.fr/engage.min.js1800.0 s19.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-solid-900.woff2604800.0 s154.8 KiB
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg604800.0 s134.8 KiB
static.spektrum.de/thumbs/masked/2307969/f720x960/up_bookcover.jpg604800.0 s130.7 KiB
assets.poool.fr/audit.min.js1800.0 s15.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-brands-400.woff2604800.0 s116.3 KiB
static.spektrum.de/thumbs/masked/2287156/f720x960/up_bookcover.jpg604800.0 s114.7 KiB
assets.poool.fr/969.js1800.0 s13.2 KiB
static.spektrum.de/thumbs/masked/2289100/f720x960/up_bookcover.jpg604800.0 s104.6 KiB
/logos/38bdeb28-e6fb-46a2-bd31-34e5d82df3c7/393649c2-8fae...86400.0 s25.3 KiB
static.spektrum.de/fm/862/f720x960/Cover_GuG_Spezial_1_2026.jpg604800.0 s94.9 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Neurodiversitaet_Teaser.jpg604800.0 s94.7 KiB
static.spektrum.de/thumbs/masked/2263409/f720x960/up_bookcover.jpg604800.0 s92.7 KiB
assets.poool.fr/vendor-access.min.js1800.0 s10.3 KiB
static.spektrum.de/fm/862/f720x960/sdw_202604n.jpg604800.0 s83.1 KiB
static.spektrum.de/js_css/assets/css/app.css604800.0 s77.0 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otTCF.js86400.0 s17.7 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_DFWDM_Teaser.jpg604800.0 s68.3 KiB
static.spektrum.de/fm/862/f720x960/SuW_052026.jpg604800.0 s68.0 KiB
static.spektrum.de/fm/862/f720x960/SdW_202605.jpg604800.0 s66.6 KiB
static.spektrum.de/fm/862/f720x960/SdW_202603.jpg604800.0 s66.3 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-187181613.jpeg604800.0 s66.1 KiB
static.spektrum.de/fm/912/f720x960/SdW_2025.jpg604800.0 s61.1 KiB
assets.poool.fr/lib-sdk.2.3.8-1771409338215.js1800.0 s6.9 KiB
assets.poool.fr/poool-sdk-v4.min.js1800.0 s6.8 KiB
static.spektrum.de/thumbs/masked/2306523/f720x960/up_bookcover.jpg604800.0 s58.0 KiB
static.spektrum.de/thumbs/masked/2289105/f720x960/up_bookcover.jpg604800.0 s57.6 KiB
static.spektrum.de/thumbs/masked/2296676/f720x960/up_bookcover.jpg604800.0 s57.2 KiB
static.spektrum.de/fm/862/f720x960/SuW_202603.jpg604800.0 s57.1 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Krebs_verstehen_Teaser.jpg604800.0 s54.8 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1181638060.jpg604800.0 s53.2 KiB
static.spektrum.de/fm/912/f720x960/Bundles_Cover_Grey-Ratgeber_Lernen_Schule.jpg604800.0 s52.6 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Diagnose_Krebs_Teaser.jpg604800.0 s51.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1405981940.jpg604800.0 s48.8 KiB
static.spektrum.de/fm/862/f720x960/GuG_202605.jpg604800.0 s48.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2223725848.jpg604800.0 s46.8 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Energiewende_Teaser.jpg604800.0 s46.7 KiB
static.spektrum.de/fm/862/f720x960/SuW_042026.jpg604800.0 s46.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2114712988.jpg604800.0 s46.0 KiB
static.spektrum.de/thumbs/masked/2307970/f720x960/up_bookcover.jpg604800.0 s46.0 KiB
static.spektrum.de/thumbs/masked/2306522/f720x960/up_bookcover.jpg604800.0 s44.8 KiB
static.spektrum.de/fm/862/f720x960/GuG_202603.jpg604800.0 s44.7 KiB
static.spektrum.de/thumbs/masked/2291594/f720x960/up_bookcover.jpg604800.0 s44.0 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
static.spektrum.de/fm/862/f720x960/GuG_202604.jpg604800.0 s42.1 KiB
/fm/912/f720x960/Digitalpaket_Kommunikation_der_Zellen_Te...604800.0 s40.4 KiB
static.spektrum.de/thumbs/masked/2291151/f720x960/up_bookcover.jpg604800.0 s40.3 KiB
static.spektrum.de/fm/1183/f720x960/Digitalpaket_Viren_Teaser.jpg604800.0 s37.7 KiB
/scripttemplates/otSDKStub.js?did=69405b66-21db-433c-a550...86400.0 s9.1 KiB
static.spektrum.de/thumbs/masked/2289104/f720x960/up_bookcover.jpg604800.0 s36.2 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2257356517.jpg604800.0 s31.9 KiB
assets.poool.fr/vendor-buddy-v3.min.js1800.0 s3.0 KiB
assets.poool.fr/vendor-buddy-v3.min.js1800.0 s3.0 KiB
static.spektrum.de/fm/912/f720x960/SdW_Digitalpaket_Sport.jpg604800.0 s25.6 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-regular-400.woff2604800.0 s25.1 KiB
static.spektrum.de/fm/912/f640x360/iStock-931752570.jpg604800.0 s24.6 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-it...604800.0 s22.4 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-it...604800.0 s22.3 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-it...604800.0 s22.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-82543290.jpeg604800.0 s21.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1952271898.jpg604800.0 s21.1 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...604800.0 s21.0 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...604800.0 s20.8 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...604800.0 s20.7 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-no...604800.0 s20.6 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...604800.0 s20.5 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-171287447_top.jpg604800.0 s18.4 KiB
static.spektrum.de/fm/912/f616x348/Spektrum_AboVorteile.jpg604800.0 s16.5 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2184628298.jpg604800.0 s15.4 KiB
static.spektrum.de/fm/912/f640x360/AdobeStock_320878541.jpeg604800.0 s15.0 KiB
static.spektrum.de/fm/912/f640x360/1-Voyager_2-copy.jpg604800.0 s14.5 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-ex...604800.0 s14.1 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-ex...604800.0 s13.9 KiB
static.spektrum.de/fm/912/f640x360/AdobeStock_532159831.jpeg604800.0 s13.1 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Angst_Teaser.jpg604800.0 s12.0 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s2.7 KiB
static.spektrum.de/fm/912/f640x360/noirlab2113a.jpg604800.0 s10.6 KiB
static.spektrum.de/fm/912/f640x360/iStock-637896906_Hayri_Er.jpg604800.0 s10.6 KiB
assets.poool.fr/vendor-poool-trim-html.min.js1800.0 s1.2 KiB
assets.poool.fr/vendor-audit.min.js1800.0 s1.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1286614781.8356611.jpg604800.0 s9.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1301828962.jpg604800.0 s8.4 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1665332936.jpg604800.0 s6.5 KiB
static.spektrum.de/js_css/assets/fonts/custom/fonts.css604800.0 s1.0 KiB
www.spektrum.de/pix/fallback.gif604800.0 s223 B
cdn.poool.fr/assets/fonts/poool-ico-2/1.3.0/Poool-Ico-2.ttf?vdi71f3600.0 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:0.007622999999999999] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-31-DIV nodeLabel:Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… path:1,HTML,1,BODY,18,DIV,1,DIV selector:body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat ot-iab-2 bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.000855] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-31-DIV nodeLabel:Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… path:1,HTML,1,BODY,18,DIV,1,DIV selector:body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat ot-iab-2 bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.000827] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-31-DIV nodeLabel:Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… path:1,HTML,1,BODY,18,DIV,1,DIV selector:body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat ot-iab-2 bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.000796] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-31-DIV nodeLabel:Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… path:1,HTML,1,BODY,18,DIV,1,DIV selector:body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat ot-iab-2 bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.000768] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-31-DIV nodeLabel:Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… path:1,HTML,1,BODY,18,DIV,1,DIV selector:body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFlat ot-iab-2 bottom vertical-align-content ot-buttons-fw" tabindex="0" style="bottom: 0px;"> type:node] score:0.000744]]
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:0.647135] map[node:map[boundingRect:map[bottom:12755 height:12755 left:175 right:1175 top:0 width:1000] lhId:page-32-DIV nodeLabel:PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… path:1,HTML,1,BODY,4,DIV selector:body.index > div#page-wrap snippet:<div id="page-wrap"> type:node] score:0.280384] map[node:map[boundingRect:map[bottom:12755 height:12755 left:175 right:1175 top:0 width:1000] lhId:page-32-DIV nodeLabel:PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… path:1,HTML,1,BODY,4,DIV selector:body.index > div#page-wrap snippet:<div id="page-wrap"> type:node] score:0.273251] map[node:map[boundingRect:map[bottom:1872 height:120 left:508 right:827 top:1753 width:318] lhId:page-34-H3 nodeLabel:TANTALNITRID : Neuer Wärmeleiter stellt physikalische Überzeugungen infrage path:1,HTML,1,BODY,4,DIV,1,DIV,6,DIV,0,DIV,5,ARTICLE,0,A,1,DIV,0,H3 selector:article.row > a > div.columns > h3.teaser__small__heading snippet:<h3 class="teaser__small__heading"> type:node] score:0.090146 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://static.spektrum.de/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-normal.woff2]] map[cause:Web font extra:map[type:url value:https://static.spektrum.de/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-normal.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:12755 height:12755 left:175 right:1175 top:0 width:1000] lhId:page-32-DIV nodeLabel:PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… path:1,HTML,1,BODY,4,DIV selector:body.index > div#page-wrap snippet:<div id="page-wrap"> type:node] score:0.003354]]

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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:42.229 source:map[column:404936 line:2 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:15.875 source:map[column:49637 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/jquery.min.js urlProvider:network]] map[reflowTime:56.614 source:map[column:50335 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/jquery.min.js urlProvider:network]] map[reflowTime:0.318 source:map[column:50393 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/jquery.min.js urlProvider:network]] map[reflowTime:0.249 source:map[column:50457 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/jquery.min.js urlProvider:network]] map[reflowTime:31.672 source:map[column:340991 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:13.78 source:map[column:350571 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:3.355 source:map[column:340058 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:1.159 source:map[column:49615 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/jquery.min.js urlProvider:network]] map[reflowTime:39.106 source:map[column:382633 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:20.826 source:map[type:text value:[unattributed]]] map[reflowTime:0.099 source:map[column:129 line:0 type:source-location url: urlProvider:network]] map[reflowTime:1.212 source:map[column:7858 line:0 type:source-location url: urlProvider:network]] map[reflowTime:2.087 source:map[column:200 line:0 type:source-location url: urlProvider:network]] map[reflowTime:1.156 source:map[column:492 line:0 type:source-location url: urlProvider:network]]]

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
Titelbild des Magazins "Spektrum der Wissenschaft Kompakt" mit dem Thema "Immun… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2307969/f720x960/up_bookcover.jpg130.3 KiB124.8 KiB
Cover der Zeitschrift "Spektrum der Wissenschaft, edition 9", mit dem Titel "Kü… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2287156/f720x960/up_bookcover.jpg114.3 KiB108.7 KiB
Eine 3D-Darstellung eines Quantencomputers in einem Rechenzentrum. Im Vordergru… a > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg134.4 KiB100.8 KiB
Eine Frau in einem weißen Kleid springt fröhlich auf einem Feld, während sie bu… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2263409/f720x960/up_bookcover.jpg92.3 KiB87.7 KiB
Eine Kiste mit gebrauchten Büchern steht auf einer Wiese, daneben sind verschie… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-187181613.jpeg65.7 KiB57.3 KiB
Eine Gruppe von Kühen steht im Schnee in einem Waldgebiet. Der Titel des Magazi… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2306523/f720x960/up_bookcover.jpg57.6 KiB54.8 KiB
Ein gelbes Magazin-Cover mit dem Titel "Spektrum der Wissenschaft KOMPAKT 13.26… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2289105/f720x960/up_bookcover.jpg57.3 KiB54.5 KiB
Titelbild des Magazins "Spektrum Geschichte" mit einem Porträt von Jakob Fugger… div.align-self-top > a.gtm-event-kiosk-tiles-image > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2296676/f720x960/up_bookcover.jpg56.8 KiB52.5 KiB
Eine digitale Darstellung eines Tunnels aus binären Zahlen, die sich spiralförm… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1181638060.jpg52.9 KiB44.5 KiB
Eine Frau in einem eleganten schwarzen Kleid geht einen langen, schwach beleuch… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2307970/f720x960/up_bookcover.jpg45.6 KiB43.3 KiB
Titelbild der Zeitschrift "Spektrum der Wissenschaft – Die Woche", Ausgabe Nr. … div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2306522/f720x960/up_bookcover.jpg44.4 KiB42.2 KiB
Titelbild des Magazins "Spektrum Dossier" mit dem Thema "Menschen im Gespräch: … div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2291594/f720x960/up_bookcover.jpg43.6 KiB41.5 KiB
Ein Stapel glänzender Kupferrohre, die eng nebeneinander liegen. Die Rohre refl… div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1405981940.jpg48.4 KiB40.0 KiB
Eine Nahaufnahme von grünen, aufrecht wachsenden Pflanzen in einem Waldgebiet. … div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-2223725848.jpg46.4 KiB37.9 KiB
Ein Mann sitzt am Strand und arbeitet auf einem Laptop, während die Sonne unter… div.swiper-wrapper > a.img > div.img-wrapper > img
static.spektrum.de/thumbs/masked/2291151/f720x960/up_bookcover.jpg39.9 KiB37.9 KiB
Eine Vielzahl bunter Zahlen in Blau, Rot und Gelb ist spiralförmig auf einem we… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-2114712988.jpg45.6 KiB37.2 KiB
Riss in einer beigen Steinwand, der unregelmäßige Bruchlinien und freiliegende … div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-2257356517.jpg31.5 KiB24.5 KiB
Eine Meeresschidkröte liegt tot am Strand a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/iStock-931752570.jpg24.3 KiB18.8 KiB
Eine Frau sitzt vor einem antiken Holzspiegel, in dem das Spiegelbild eines Mäd… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-82543290.jpeg21.3 KiB16.5 KiB
Eine digitale Kunstabbildung mit einem abstrakten, glitchartigen Design. Die Ko… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1952271898.jpg20.8 KiB16.1 KiB
Eine Person hält ein quadratisches Glasstück vor ihr rechtes Auge, wodurch das … a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-171287447_top.jpg18.0 KiB14.0 KiB
Spektrum AboVorteilswelt div.campaign-box > a > div.img-wrapper > img.full
static.spektrum.de/fm/912/f616x348/Spektrum_AboVorteile.jpg16.2 KiB12.3 KiB
Zwei Personen stehen vor einer Glaswand, die mit bunten Haftnotizen bedeckt ist… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-2184628298.jpg15.1 KiB11.7 KiB
Silhouette eines Paares bei Nacht vor Großstadtlichtern a > figure.teaser__grid__image > div.img-wrapper > img.full
static.spektrum.de/fm/912/f640x360/AdobeStock_320878541.jpeg14.6 KiB11.3 KiB
Im interstellaren Raum div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/1-Voyager_2-copy.jpg14.1 KiB11.0 KiB
Eine Hand greift nach einer grünen Zapfpistole an einer Tankstelle. Mehrere Zap… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/AdobeStock_532159831.jpeg12.8 KiB9.9 KiB
Illustration einer Punktmenge div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/iStock-637896906_Hayri_Er.jpg10.3 KiB8.0 KiB
Eine Spiralgalaxie im Weltraum, umgeben von zahlreichen Sternen. Die Galaxie ze… div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/noirlab2113a.jpg10.2 KiB7.9 KiB
Eine künstlerische Darstellung eines astronomischen Phänomens zeigt eine leucht… div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1286614781.8356611.jpg9.2 KiB7.1 KiB
Eine Hand hält einen Plüsch-Hasen auf einer dunkelgrünen Oberfläche. Das Bild i… div.columns > figure > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1301828962.jpg8.1 KiB6.3 KiB
Ein weißer Behälter mit rotem Deckel liegt auf einem gelben Hintergrund. Aus de… a > figure.teaser__grid__image > div.img-wrapper > img
static.spektrum.de/fm/912/f640x360/GettyImages-1665332936.jpg6.1 KiB4.8 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 3D-Darstellung eines Quantencomputers in einem Rechenzentrum. Im Vordergru…
path: 1,HTML,1,BODY,4,DIV,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,A,1,FIGURE,0,DIV,0,IMG
selector: a > figure > div.img-wrapper > img
snippet: <img alt="Eine 3D-Darstellung eines Quantencomputers in einem Rechenzentrum. Im Vord…" src="https://static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg">

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
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
static.spektrum.de/js_css/assets/js/jquery.min.js29.1 KiB
static.spektrum.de/js_css/assets/css/app.css77.0 KiB316 ms

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 201 ms
URLTime Spent
spektrum.de/201 ms
www.spektrum.de/0.0 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
PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… body.index > div#page-wrap
0.280
PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… body.index > div#page-wrap
0.273
TANTALNITRID : Neuer Wärmeleiter stellt physikalische Überzeugungen infrage article.row > a > div.columns > h3.teaser__small__heading
0.090
PRODUKTE ABO/SHOP SERVICE LOGIN ASTRONOMIE BIOLOGIE CHEMIE ERDE/UMWELT IT… body.index > div#page-wrap
0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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.

Estimated savings: 80 ms 93.6 KiB
URLTransfer SizeEst Savings
static.spektrum.de/js_css/assets/css/app.css76.7 KiB71.4 KiB
22.6 KiB22.3 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: 80 ms 294.7 KiB
URLTransfer SizeEst Savings
static.spektrum.de/js_css/assets/js/app.js139.4 KiB93.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M171.0 KiB74.4 KiB
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1171.5 KiB64.5 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js130.8 KiB62.0 KiB

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 Evaluation1.2 s
Other398 ms
Style & Layout370 ms
Rendering128 ms
Script Parsing & Compilation115 ms
Parse HTML & CSS65 ms
Garbage Collection30 ms

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
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1171.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M171.4 KiB
assets.poool.fr/advanced-paywall-frame.min.js157.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-solid-900.woff2154.8 KiB
static.spektrum.de/js_css/assets/js/app.js139.7 KiB
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg134.8 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js131.0 KiB
static.spektrum.de/thumbs/masked/2307969/f720x960/up_bookcover.jpg130.7 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-brands-400.woff2116.3 KiB
static.spektrum.de/thumbs/masked/2287156/f720x960/up_bookcover.jpg114.7 KiB

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

●Max Potential First Input Delay 130 ms
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 20 user timings
●JavaScript execution time 1.1 s
●Avoid long main-thread tasks 5 long tasks found
●Avoid non-composited animations 1 animated element found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 10 ms
●Server Backend Latencies 210 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 10 ms
○INP breakdown
90

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
PRODUKTE nav.header__top__nav > ul.header__top__nav__menu > li.context > a
ABO/SHOP nav.header__top__nav > ul.header__top__nav__menu > li.context > a
SERVICE nav.header__top__nav > ul.header__top__nav__menu > li.context > a

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.

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
Newsletter nav.columns > ul.no-bullet > li > a
Kontakt nav.columns > ul.no-bullet > li > a
Spektrum Shop nav.columns > ul.no-bullet > li > a
Im Handel kaufen nav.columns > ul.no-bullet > li > a
Mediadaten nav.columns > ul.no-bullet > li > a
Datenschutz nav.columns > ul.no-bullet > li > a
Nutzungsbedingungen nav.columns > ul.no-bullet > li > a
Cookie-Einstellungen nav.columns > ul.no-bullet > li > a#ot-sdk-btn
Alle Artikel nav.columns > ul.no-bullet > li > a
Impressum nav.columns > ul.no-bullet > li > a
Für Spektrum schreiben nav.columns > ul.no-bullet > li > a
Zugänglichkeitserklärung nav.columns > ul.no-bullet > li > 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-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[aria-*]` attributes have valid values
●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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<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
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Deprecated ARIA roles were not used
○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
○`[role]`s have all required `[aria-*]` attributes
○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
○`[role]` values are valid
○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
○Buttons have an accessible name
○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.
○`[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.
○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.
100

Best Practices

General

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.

URL
static.spektrum.de/js_css/assets/js/app.js
●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 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 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
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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