C — https://spektrum.de | BeaverCheck Audit

Site Health

Score: 75 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Good content signals with minor gaps.

Reasonable footprint with room for optimization.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

core-js · 1488 peers

You 75

Avg 72

At average

0 50 100

Better than 76% of core-js sites See full core-js benchmark →

Font Awesome · 515 peers

You 75

Avg 73

At average

0 50 100

Better than 70% of Font Awesome sites See full Font Awesome benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

No <main> landmark found

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Landmark Structure

77 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

Cross-Origin-Embedder-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fspektrum.de)](https://beavercheck.com/results/4fff88cc-8fc9-48a3-b3e4-8f56f9e1d0fd)

HTML

<a href="https://beavercheck.com/results/4fff88cc-8fc9-48a3-b3e4-8f56f9e1d0fd"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fspektrum.de" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fspektrum.de

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 12.9s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.

1 accessibility issue excludes users who rely on assistive technology.

Your LCP is 12.9s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

Conversion Barriers

4 critical 5 warning

9 barrier(s) likely increasing bounce by ~37%.

Speed (2)

Page takes 12.9s to load

+12% bounce

Users abandon at ~3s — you're 10.4s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 2.2s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (3)

Mixed content on HTTPS page

+8% bounce

Browsers block insecure subresources — broken images, missing scripts, warning badge

Fix: Change http:// URLs inside the page to https:// (or protocol-relative)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (1)

Severe layout shift during page load

+6% bounce

Users mis-click when content jumps — converting intent into frustration

Fix: Reserve space for images, ads, and embeds with explicit width/height

Content (1)

Content is hard to read

+2% bounce

Graduate-level reading difficulty — limits the addressable audience for product or blog pages

Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60

Navigation (2)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

2 broken link(s) on the page

+3% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

€450 investment → €1,402/month returns + EUR 120,500,000 risk avoided

Payback period: < 1 month First-year ROI: +3638%

Investment

€450

5h · 5 findings

Monthly returns

€1,402 /mo

~€16,822 / year

Conversions recovered €1,401
Bandwidth savings €0.50

Regulatory risk avoided

EUR 120,500,000

if kept compliant

ePrivacy Directive EUR 100,000,000
DSGVO EUR 20,000,000
EAA EUR 500,000

Payback period

0 12mo 24mo

€135 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

€450

5.0 developer hours at €90/hr

Based on Germany rates (€90/hr)

Quick wins

€135 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

€ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

€10,041,667 / month at risk

~€120,500,006 / year if left unfixed

Compliance Risk

€120,500,000

ePrivacy DirectiveDSGVOEAA

No privacy policy link detected
DSGVO: EUR 10,000 – EUR 20,000,000
2 advertising/retargeting trackers detected
DSGVO: EUR 10,000 – EUR 20,000,000
Trackers detected but no cookie policy found
DSGVO: EUR 5,000 – EUR 10,000,000

+6 more

Bandwidth Waste

€0.50 /mo

6776.1 MB/mo × 0.074 EUR/GB

Optimize transfer: save ~678 KB per page load
Saves €0.50/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 3 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.02 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

12.93 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

2.19 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

2.081

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

8.77 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

16.36 s

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.

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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.

Request	Cache TTL	Transfer Size
assets.poool.fr/advanced-paywall-frame.min.js	1800.0 s	157.1 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	86400.0 s	131.0 KiB
assets.poool.fr/access.min.js	1800.0 s	31.1 KiB
assets.poool.fr/engage.min.js	1800.0 s	19.3 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-solid-900.woff2	604800.0 s	154.8 KiB
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg	604800.0 s	134.9 KiB
assets.poool.fr/audit.min.js	1800.0 s	15.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-brands-400.woff2	604800.0 s	116.3 KiB
assets.poool.fr/969.js	1800.0 s	13.2 KiB
/logos/38bdeb28-e6fb-46a2-bd31-34e5d82df3c7/393649c2-8fae...	86400.0 s	25.3 KiB
assets.poool.fr/vendor-access.min.js	1800.0 s	10.3 KiB
static.spektrum.de/js_css/assets/css/app.css	604800.0 s	77.0 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otTCF.js	86400.0 s	17.7 KiB
assets.poool.fr/lib-sdk.2.3.8-1771409338215.js	1800.0 s	6.9 KiB
assets.poool.fr/poool-sdk-v4.min.js	1800.0 s	6.8 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1405981940.jpg	604800.0 s	48.7 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2223725848.jpg	604800.0 s	46.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
/scripttemplates/otSDKStub.js?did=69405b66-21db-433c-a550...	86400.0 s	9.1 KiB
assets.poool.fr/vendor-buddy-v3.min.js	1800.0 s	3.0 KiB
assets.poool.fr/vendor-buddy-v3.min.js	1800.0 s	3.0 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-regular-400.woff2	604800.0 s	25.1 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-it...	604800.0 s	22.4 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-it...	604800.0 s	22.4 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-it...	604800.0 s	22.0 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...	604800.0 s	20.8 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...	604800.0 s	20.8 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-no...	604800.0 s	20.8 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...	604800.0 s	20.7 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...	604800.0 s	20.5 KiB
static.spektrum.de/fm/912/f640x360/1-Voyager_2-copy.jpg	604800.0 s	14.5 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-ex...	604800.0 s	14.2 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-ex...	604800.0 s	13.9 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.7 KiB
static.spektrum.de/fm/912/f640x360/noirlab2113a.jpg	604800.0 s	10.6 KiB
assets.poool.fr/vendor-poool-trim-html.min.js	1800.0 s	1.2 KiB
assets.poool.fr/vendor-audit.min.js	1800.0 s	1.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1286614781.8356611.jpg	604800.0 s	9.5 KiB
static.spektrum.de/js_css/assets/fonts/custom/fonts.css	604800.0 s	1.0 KiB
www.spektrum.de/pix/fallback.gif	604800.0 s	227 B
cdn.poool.fr/assets/fonts/poool-ico-2/1.3.0/Poool-Ico-2.ttf?vdi71f	3600.0 s	0 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:0.022243000000000002] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-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:0.00287] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-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:0.002839] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-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:0.002808] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-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:0.002786] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-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:0.002764]]

items: [map[node:map[type:text value:Total] score:2.0811070000000003] map[node:map[boundingRect:map[bottom:29410 height:29410 left:0 right:412 top:0 width:412] lhId:page-5-DIV nodeLabel:HEUTE AKTUELLMEISTGELESENNEUERSCHEINUNGEN SPEKTRUM.DE - NACHRICHTEN AUS WISSENS… path:1,HTML,1,BODY,4,DIV selector:body.index > div#page-wrap snippet:<div id="page-wrap"> type:node] score:1] map[node:map[boundingRect:map[bottom:29410 height:29410 left:0 right:412 top:0 width:412] lhId:page-5-DIV nodeLabel:HEUTE AKTUELLMEISTGELESENNEUERSCHEINUNGEN SPEKTRUM.DE - NACHRICHTEN AUS WISSENS… path:1,HTML,1,BODY,4,DIV selector:body.index > div#page-wrap snippet:<div id="page-wrap"> type:node] score:1] map[node:map[boundingRect:map[bottom:3021 height:44 left:0 right:412 top:2977 width:412] lhId:page-6-A nodeLabel:Anstieg des Meeresspiegels | Was Venedig vor dem Untergang bewahren kann path:1,HTML,1,BODY,4,DIV,1,DIV,6,DIV,0,DIV,4,DIV,0,DIV,0,UL,2,LI,0,A selector:div.columns > ul.no-bullet > li.teaser__line__left > a.hl snippet:<a class="hl" href="/news/anstieg-des-meeresspiegels-was-venedig-vor-dem-untergang-bewahrt/232…"> type:node] score:0.040568 subItems:map[items:[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:3021 height:44 left:0 right:412 top:2977 width:412] lhId:page-6-A nodeLabel:Anstieg des Meeresspiegels | Was Venedig vor dem Untergang bewahren kann path:1,HTML,1,BODY,4,DIV,1,DIV,6,DIV,0,DIV,4,DIV,0,DIV,0,UL,2,LI,0,A selector:div.columns > ul.no-bullet > li.teaser__line__left > a.hl snippet:<a class="hl" href="/news/anstieg-des-meeresspiegels-was-venedig-vor-dem-untergang-bewahrt/232…"> type:node] score:0.040539 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]]] type:subitems]]]

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:12.166 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:16.604 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:66.092 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:0.344 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:0.251 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:15.774 source:map[column:340991 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:6.823 source:map[column:386387 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:7.202 source:map[column:350571 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:3.67 source:map[column:340058 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js urlProvider:network]] map[reflowTime:0.885 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:7.973 source:map[column:382633 line:1 type:source-location url:https://static.spektrum.de/js_css/assets/js/app.js 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.

	URL	Resource Size	Est Savings
Eine 3D-Darstellung eines Quantencomputers in einem Rechenzentrum. Im Vordergru… `a > figure > div.img-wrapper > img`	static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg	134.4 KiB	116.9 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.jpg	48.4 KiB	10.9 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.jpg	46.4 KiB	8.9 KiB

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.

URL	Transfer Size	Duration
static.spektrum.de/js_css/assets/js/jquery.min.js	29.1 KiB	151 ms
static.spektrum.de/js_css/assets/css/app.css	77.0 KiB	1.2 s

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: 752 ms

URL	Time Spent
spektrum.de/	752 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.

Element	Layout shift score
HEUTE AKTUELLMEISTGELESENNEUERSCHEINUNGEN SPEKTRUM.DE - NACHRICHTEN AUS WISSENS… `body.index > div#page-wrap`	1.000
HEUTE AKTUELLMEISTGELESENNEUERSCHEINUNGEN SPEKTRUM.DE - NACHRICHTEN AUS WISSENS… `body.index > div#page-wrap`	1.000
Anstieg des Meeresspiegels \| Was Venedig vor dem Untergang bewahren kann `div.columns > ul.no-bullet > li.teaser__line__left > a.hl`	0.041
Anstieg des Meeresspiegels \| Was Venedig vor dem Untergang bewahren kann `div.columns > ul.no-bullet > li.teaser__line__left > a.hl`	0.041
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003
Ihre Privatsphäre ist uns wichtigWir und unsere 223-Partner speichern und greif… `body.index > div#onetrust-consent-sdk > div#onetrust-banner-sdk`	0.003

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

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: 600 ms 95.0 KiB

URL	Transfer Size	Est Savings
static.spektrum.de/js_css/assets/css/app.css	76.7 KiB	72.7 KiB
	22.6 KiB	22.2 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 1.5 s 294.9 KiB

URL	Transfer Size	Est Savings
static.spektrum.de/js_css/assets/js/app.js	139.4 KiB	93.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M	171.0 KiB	74.4 KiB
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1h1	171.5 KiB	64.7 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	130.8 KiB	62.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
static.spektrum.de/js_css/assets/js/app.js	2.3 s	1.3 s	78 ms
www.spektrum.de/	1.8 s	37 ms	5.9 ms
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M	1.1 s	866 ms	84 ms
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	783 ms	458 ms	98 ms
Unattributable	724 ms	14 ms	0.0 ms
cdn.cookielaw.org/scripttemplates/202604.1.0/otTCF.js	648 ms	575 ms	11 ms
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1h1	456 ms	387 ms	64 ms
static.spektrum.de/js_css/iqd/cdn_spektrum_mob_digt/live/iqadcontroller.js	414 ms	203 ms	110 ms
/scripttemplates/otSDKStub.js?did=69405b66-21db-433c-a550...	180 ms	135 ms	3.6 ms
assets.poool.fr/access.min.js	157 ms	135 ms	18 ms
static.spektrum.de/js_css/assets/js/jquery.min.js	105 ms	78 ms	12 ms
assets.poool.fr/vendor-access.min.js	89 ms	81 ms	3.2 ms
assets.poool.fr/vendor-buddy-v3.min.js	60 ms	59 ms	1.2 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.

Category	Time Spent
Script Evaluation	4.5 s
Other	1.6 s
Style & Layout	1.5 s
Script Parsing & Compilation	514 ms
Rendering	487 ms
Parse HTML & CSS	275 ms
Garbage Collection	161 ms

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
Christoph Pöppe `a > figure.teaser__grid__image > div.author-img-wrap > img.image`	www.spektrum.de/pix/fallback.gif
Bettina Wurche `a > figure.teaser__grid__image > div.author-img-wrap > img.image`	www.spektrum.de/pix/fallback.gif
Michael Blume `a > figure.teaser__grid__image > div.author-img-wrap > img.image`	www.spektrum.de/pix/fallback.gif

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

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,206 KiB

●User Timing marks and measures 20 user timings

●Avoid long main-thread tasks 20 long tasks found

●Avoid non-composited animations 1 animated element found

●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 0 ms

○INP breakdown

○LCP request discovery

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.

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
PRINTAUSGABEN `div.columns > div.row > ul.columns > li.kiosk__bar__category__print`
TOPSELLER `div.columns > div.row > ul.columns > li.kiosk__bar__category__topseller`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
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

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●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

○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

○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

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○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

○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`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

982 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.62 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

137 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.647

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.04 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.94 s

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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.

Request	Cache TTL	Transfer Size
assets.poool.fr/advanced-paywall-frame.min.js	1800.0 s	157.1 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	86400.0 s	131.0 KiB
assets.poool.fr/access.min.js	1800.0 s	31.3 KiB
assets.poool.fr/engage.min.js	1800.0 s	19.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-solid-900.woff2	604800.0 s	154.8 KiB
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg	604800.0 s	134.8 KiB
static.spektrum.de/thumbs/masked/2307969/f720x960/up_bookcover.jpg	604800.0 s	130.7 KiB
assets.poool.fr/audit.min.js	1800.0 s	15.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-brands-400.woff2	604800.0 s	116.3 KiB
static.spektrum.de/thumbs/masked/2287156/f720x960/up_bookcover.jpg	604800.0 s	114.7 KiB
assets.poool.fr/969.js	1800.0 s	13.2 KiB
static.spektrum.de/thumbs/masked/2289100/f720x960/up_bookcover.jpg	604800.0 s	104.6 KiB
/logos/38bdeb28-e6fb-46a2-bd31-34e5d82df3c7/393649c2-8fae...	86400.0 s	25.3 KiB
static.spektrum.de/fm/862/f720x960/Cover_GuG_Spezial_1_2026.jpg	604800.0 s	94.9 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Neurodiversitaet_Teaser.jpg	604800.0 s	94.7 KiB
static.spektrum.de/thumbs/masked/2263409/f720x960/up_bookcover.jpg	604800.0 s	92.7 KiB
assets.poool.fr/vendor-access.min.js	1800.0 s	10.3 KiB
static.spektrum.de/fm/862/f720x960/sdw_202604n.jpg	604800.0 s	83.1 KiB
static.spektrum.de/js_css/assets/css/app.css	604800.0 s	77.0 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otTCF.js	86400.0 s	17.7 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_DFWDM_Teaser.jpg	604800.0 s	68.3 KiB
static.spektrum.de/fm/862/f720x960/SuW_052026.jpg	604800.0 s	68.0 KiB
static.spektrum.de/fm/862/f720x960/SdW_202605.jpg	604800.0 s	66.6 KiB
static.spektrum.de/fm/862/f720x960/SdW_202603.jpg	604800.0 s	66.3 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-187181613.jpeg	604800.0 s	66.1 KiB
static.spektrum.de/fm/912/f720x960/SdW_2025.jpg	604800.0 s	61.1 KiB
assets.poool.fr/lib-sdk.2.3.8-1771409338215.js	1800.0 s	6.9 KiB
assets.poool.fr/poool-sdk-v4.min.js	1800.0 s	6.8 KiB
static.spektrum.de/thumbs/masked/2306523/f720x960/up_bookcover.jpg	604800.0 s	58.0 KiB
static.spektrum.de/thumbs/masked/2289105/f720x960/up_bookcover.jpg	604800.0 s	57.6 KiB
static.spektrum.de/thumbs/masked/2296676/f720x960/up_bookcover.jpg	604800.0 s	57.2 KiB
static.spektrum.de/fm/862/f720x960/SuW_202603.jpg	604800.0 s	57.1 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Krebs_verstehen_Teaser.jpg	604800.0 s	54.8 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1181638060.jpg	604800.0 s	53.2 KiB
static.spektrum.de/fm/912/f720x960/Bundles_Cover_Grey-Ratgeber_Lernen_Schule.jpg	604800.0 s	52.6 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Diagnose_Krebs_Teaser.jpg	604800.0 s	51.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1405981940.jpg	604800.0 s	48.8 KiB
static.spektrum.de/fm/862/f720x960/GuG_202605.jpg	604800.0 s	48.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2223725848.jpg	604800.0 s	46.8 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Energiewende_Teaser.jpg	604800.0 s	46.7 KiB
static.spektrum.de/fm/862/f720x960/SuW_042026.jpg	604800.0 s	46.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2114712988.jpg	604800.0 s	46.0 KiB
static.spektrum.de/thumbs/masked/2307970/f720x960/up_bookcover.jpg	604800.0 s	46.0 KiB
static.spektrum.de/thumbs/masked/2306522/f720x960/up_bookcover.jpg	604800.0 s	44.8 KiB
static.spektrum.de/fm/862/f720x960/GuG_202603.jpg	604800.0 s	44.7 KiB
static.spektrum.de/thumbs/masked/2291594/f720x960/up_bookcover.jpg	604800.0 s	44.0 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
static.spektrum.de/fm/862/f720x960/GuG_202604.jpg	604800.0 s	42.1 KiB
/fm/912/f720x960/Digitalpaket_Kommunikation_der_Zellen_Te...	604800.0 s	40.4 KiB
static.spektrum.de/thumbs/masked/2291151/f720x960/up_bookcover.jpg	604800.0 s	40.3 KiB
static.spektrum.de/fm/1183/f720x960/Digitalpaket_Viren_Teaser.jpg	604800.0 s	37.7 KiB
/scripttemplates/otSDKStub.js?did=69405b66-21db-433c-a550...	86400.0 s	9.1 KiB
static.spektrum.de/thumbs/masked/2289104/f720x960/up_bookcover.jpg	604800.0 s	36.2 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2257356517.jpg	604800.0 s	31.9 KiB
assets.poool.fr/vendor-buddy-v3.min.js	1800.0 s	3.0 KiB
assets.poool.fr/vendor-buddy-v3.min.js	1800.0 s	3.0 KiB
static.spektrum.de/fm/912/f720x960/SdW_Digitalpaket_Sport.jpg	604800.0 s	25.6 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-regular-400.woff2	604800.0 s	25.1 KiB
static.spektrum.de/fm/912/f640x360/iStock-931752570.jpg	604800.0 s	24.6 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-it...	604800.0 s	22.4 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-it...	604800.0 s	22.3 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-it...	604800.0 s	22.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-82543290.jpeg	604800.0 s	21.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1952271898.jpg	604800.0 s	21.1 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...	604800.0 s	21.0 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-no...	604800.0 s	20.8 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...	604800.0 s	20.7 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-no...	604800.0 s	20.6 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-400-latin-no...	604800.0 s	20.5 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-171287447_top.jpg	604800.0 s	18.4 KiB
static.spektrum.de/fm/912/f616x348/Spektrum_AboVorteile.jpg	604800.0 s	16.5 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-2184628298.jpg	604800.0 s	15.4 KiB
static.spektrum.de/fm/912/f640x360/AdobeStock_320878541.jpeg	604800.0 s	15.0 KiB
static.spektrum.de/fm/912/f640x360/1-Voyager_2-copy.jpg	604800.0 s	14.5 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-700-latin-ex...	604800.0 s	14.1 KiB
/js_css/assets/fonts/custom/Roboto_Condensed-300-latin-ex...	604800.0 s	13.9 KiB
static.spektrum.de/fm/912/f640x360/AdobeStock_532159831.jpeg	604800.0 s	13.1 KiB
static.spektrum.de/fm/912/f720x960/Digitalpaket_Angst_Teaser.jpg	604800.0 s	12.0 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.7 KiB
static.spektrum.de/fm/912/f640x360/noirlab2113a.jpg	604800.0 s	10.6 KiB
static.spektrum.de/fm/912/f640x360/iStock-637896906_Hayri_Er.jpg	604800.0 s	10.6 KiB
assets.poool.fr/vendor-poool-trim-html.min.js	1800.0 s	1.2 KiB
assets.poool.fr/vendor-audit.min.js	1800.0 s	1.1 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1286614781.8356611.jpg	604800.0 s	9.6 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1301828962.jpg	604800.0 s	8.4 KiB
static.spektrum.de/fm/912/f640x360/GettyImages-1665332936.jpg	604800.0 s	6.5 KiB
static.spektrum.de/js_css/assets/fonts/custom/fonts.css	604800.0 s	1.0 KiB
www.spektrum.de/pix/fallback.gif	604800.0 s	223 B
cdn.poool.fr/assets/fonts/poool-ico-2/1.3.0/Poool-Ico-2.ttf?vdi71f	3600.0 s	0 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.

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]]

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.

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.

	URL	Resource Size	Est 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.jpg	130.3 KiB	124.8 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.jpg	114.3 KiB	108.7 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.jpg	134.4 KiB	100.8 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.jpg	92.3 KiB	87.7 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.jpeg	65.7 KiB	57.3 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.jpg	57.6 KiB	54.8 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.jpg	57.3 KiB	54.5 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.jpg	56.8 KiB	52.5 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.jpg	52.9 KiB	44.5 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.jpg	45.6 KiB	43.3 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.jpg	44.4 KiB	42.2 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.jpg	43.6 KiB	41.5 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.jpg	48.4 KiB	40.0 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.jpg	46.4 KiB	37.9 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.jpg	39.9 KiB	37.9 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.jpg	45.6 KiB	37.2 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.jpg	31.5 KiB	24.5 KiB
Eine Meeresschidkröte liegt tot am Strand `a > figure.teaser__grid__image > div.img-wrapper > img`	static.spektrum.de/fm/912/f640x360/iStock-931752570.jpg	24.3 KiB	18.8 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.jpeg	21.3 KiB	16.5 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.jpg	20.8 KiB	16.1 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.jpg	18.0 KiB	14.0 KiB
Spektrum AboVorteilswelt `div.campaign-box > a > div.img-wrapper > img.full`	static.spektrum.de/fm/912/f616x348/Spektrum_AboVorteile.jpg	16.2 KiB	12.3 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.jpg	15.1 KiB	11.7 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.jpeg	14.6 KiB	11.3 KiB
Im interstellaren Raum `div.columns > figure > div.img-wrapper > img`	static.spektrum.de/fm/912/f640x360/1-Voyager_2-copy.jpg	14.1 KiB	11.0 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.jpeg	12.8 KiB	9.9 KiB
Illustration einer Punktmenge `div.columns > figure > div.img-wrapper > img`	static.spektrum.de/fm/912/f640x360/iStock-637896906_Hayri_Er.jpg	10.3 KiB	8.0 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.jpg	10.2 KiB	7.9 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.jpg	9.2 KiB	7.1 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.jpg	8.1 KiB	6.3 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.jpg	6.1 KiB	4.8 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.

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.

URL	Transfer Size	Duration
static.spektrum.de/js_css/assets/js/jquery.min.js	29.1 KiB
static.spektrum.de/js_css/assets/css/app.css	77.0 KiB	316 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

URL	Time Spent
spektrum.de/	201 ms
www.spektrum.de/	0.0 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout 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

URL	Transfer Size	Est Savings
static.spektrum.de/js_css/assets/css/app.css	76.7 KiB	71.4 KiB
	22.6 KiB	22.3 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 80 ms 294.7 KiB

URL	Transfer Size	Est Savings
static.spektrum.de/js_css/assets/js/app.js	139.4 KiB	93.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M	171.0 KiB	74.4 KiB
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1	171.5 KiB	64.5 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	130.8 KiB	62.0 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.

Category	Time Spent
Script Evaluation	1.2 s
Other	398 ms
Style & Layout	370 ms
Rendering	128 ms
Script Parsing & Compilation	115 ms
Parse HTML & CSS	65 ms
Garbage Collection	30 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.

URL	Transfer Size
www.googletagmanager.com/gtag/js?id=G-YXNVZ6NX0G&cx=c&gtm=4e64k1	171.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV9D2M	171.4 KiB
assets.poool.fr/advanced-paywall-frame.min.js	157.1 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-solid-900.woff2	154.8 KiB
static.spektrum.de/js_css/assets/js/app.js	139.7 KiB
static.spektrum.de/fm/912/f2000x857/GettyImages-2214879776.jpg	134.8 KiB
cdn.cookielaw.org/scripttemplates/202604.1.0/otBannerSdk.js	131.0 KiB
static.spektrum.de/thumbs/masked/2307969/f720x960/up_bookcover.jpg	130.7 KiB
static.spektrum.de/js_css/assets/fonts/fontawesome/webfonts/fa-brands-400.woff2	116.3 KiB
static.spektrum.de/thumbs/masked/2287156/f720x960/up_bookcover.jpg	114.7 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

Accessibility

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

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

○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`

Results for https://spektrum.de

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

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What fixing these means

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Speed (2)

Trust (3)

Usability (1)

Content (1)

Navigation (2)

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ARIA

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