Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

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.

Request	Cache TTL	Transfer Size
/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0V...	21600.0 s	180.7 KiB
/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQ...	21600.0 s	156.3 KiB
app.usercentrics.eu/browser-ui/latest/loader.js	3600.0 s	10.8 KiB
mosaic02.ztat.net/rnd/ng/app-qr-code/app-qr.png	0.0 ms	7.7 KiB
www.zalando.es/akam/13/54f5f134	21600.0 s	9.3 KiB
js-de.sentry-cdn.com/83b56e9b949f4d020211cbf6b3e542ad.min.js	3600.0 s	2.8 KiB
app.eu.usercentrics.eu/session/1px.png?settingsId=arL_G7jv7	1800.0 s	1.2 KiB

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.

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
Cuatro personas al aire libre; una mujer con pantalones cortos rojos lanza una … `div.JT3_zV > div.KVKCn3 > picture > img.mo6ZnF`	/cnt/contentful-apps/uploads/13ea1dd6-f848-4e87-a066-b9c0...	168.8 KiB	112.4 KiB
Joven mujer y hombre sentados en una acera compartiendo aceitunas verdes de un … `div.JT3_zV > div.KVKCn3 > picture > img.mo6ZnF`	/cnt/contentful-apps/uploads/025b3024-2959-4fe4-8cb8-68bc...	99.2 KiB	47.4 KiB
QR Code Download App `div.QjLAB7 > div._0xLoFW > div._0xLoFW > img.EKabf7`	mosaic02.ztat.net/rnd/ng/app-qr-code/app-qr.png	7.3 KiB	6.6 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-1-IMG

nodeLabel: Joven mujer y hombre sentados en una acera compartiendo aceitunas verdes de un …

path: 1,HTML,1,BODY,2,DIV,2,DIV,1,DIV,0,DIV,0,DIV,19,MAIN,0,DIV,0,DIV,2,DIV,0,DIV,1,DIV,0,DIV,0,UL,0,LI,0,DIV,0,DIV,0,DIV,0,PICTURE,1,IMG

selector: div.JT3_zV > div.KVKCn3 > picture > img.mo6ZnF

snippet: <img draggable="false" class="mo6ZnF KLaowZ nI4Wf-" alt="Joven mujer y hombre sentados en una acera compartiendo aceitunas verdes d…" src="https://img01.ztat.net/cnt/contentful-apps/uploads/025b3024-2959-4fe4-8cb8…">

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

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

value: No additional origins are good candidates for preconnecting

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
mosaic03.ztat.net/seo/glados/951888b0d65dc157047c-main.css	468 B	259 ms
mosaic02.ztat.net/zds/dx-ui/lib/atom-78.11.6.css	33.2 KiB	376 ms
mosaic02.ztat.net/zds/tokens/tokens-lagom-stage-1-typography-3.13.24.css	3.6 KiB	258 ms
mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-styles.css	8.6 KiB	260 ms
mosaic01.ztat.net/base-assets/9-1-0/assets/style.css	3.1 KiB	220 ms
js-de.sentry-cdn.com/83b56e9b949f4d020211cbf6b3e542ad.min.js	2.8 KiB	202 ms

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
mosaic01.ztat.net/zds/assets/fonts/76a99f7.woff2	20 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: 249 ms

URL	Time Spent
zalando.com/	249 ms
www.zalando.es/	0.0 ms

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

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 40 ms 3.4 KiB

URL	Transfer Size	Est Savings
mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-styles.css	8.6 KiB	3.4 KiB

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: 40 ms 28.4 KiB

URL	Transfer Size	Est Savings
mosaic02.ztat.net/zds/dx-ui/lib/atom-78.11.6.css	32.8 KiB	28.4 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 240 ms 763.7 KiB

URL	Transfer Size	Est Savings
mosaic03.ztat.net/seo/glados/cbad27c6eaa5e42abf15-main.js	225.4 KiB	196.9 KiB
mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js	172.9 KiB	121.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-T3W9FX&l=dataLayer	150.5 KiB	74.4 KiB
www.googletagmanager.com/gtag/js?id=AW-1006368194&cx=c&gtm=4e6550	143.8 KiB	66.1 KiB
mosaic01.ztat.net/pnl/gtag/js?id=G-MDW1S9PQPW&l=dataLayerGA4	170.6 KiB	62.3 KiB
app.usercentrics.eu/browser-ui/3.101.0/index.module.js	120.6 KiB	53.3 KiB
mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.js	157.9 KiB	47.6 KiB
/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0V...	179.8 KiB	39.2 KiB
/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQ...	156.1 KiB	30.7 KiB
app.usercentrics.eu/browser-ui/3.101.0/VirtualServiceItem-ba2ffbd9.js	48.7 KiB	26.6 KiB
mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.js	79.8 KiB	23.4 KiB
mosaic02.ztat.net/rnd/ng/header/index-5988b4452e5a672fb3e0.js	35.3 KiB	21.5 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 3.7 KiB

URL	Transfer Size	Est Savings
mosaic01.ztat.net/base-assets/9-1-0/require-2.1.22.min.js	7.9 KiB	3.7 KiB

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
mosaic03.ztat.net/seo/glados/cbad27c6eaa5e42abf15-main.js	225.9 KiB
/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0V...	180.7 KiB
mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js	173.4 KiB
mosaic01.ztat.net/pnl/gtag/js?id=G-MDW1S9PQPW&l=dataLayerGA4	171.0 KiB
/cnt/contentful-apps/uploads/13ea1dd6-f848-4e87-a066-b9c0...	169.3 KiB
mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.js	158.4 KiB
/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQ...	156.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-T3W9FX&l=dataLayer	150.9 KiB
www.googletagmanager.com/gtag/js?id=AW-1006368194&cx=c&gtm=4e6550	143.9 KiB
/cnt/contentful-apps/uploads/754e879d-03bc-49c9-9502-b0f9...	126.8 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
QR Code Download App `div.QjLAB7 > div._0xLoFW > div._0xLoFW > img.EKabf7`	mosaic02.ztat.net/rnd/ng/app-qr-code/app-qr.png

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

●Max Potential First Input Delay 80 ms

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 20 user timings

●JavaScript execution time 1.1 s

●Minimizes main-thread work 1.7 s

●Avoid long main-thread tasks 4 long tasks found

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 100 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 30 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Asistente de Zalando `div > div > div > div.uyF88V`

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
div.AnNemq > div.w5w9i_ > div.KLaowZ > div#navigation-overlay-main-container `div.AnNemq > div.w5w9i_ > div.KLaowZ > div#navigation-overlay-main-container`

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.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

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

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

●`[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

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

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

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js

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.

●Uses HTTPS

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

URL	Map URL
/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0V...
mosaic02.ztat.net/rnd/ng/skip-buttons/index-47ae60797082eeff236c.js	zalando.de/dev/source-maps/skip-buttons/index-47ae60797082eeff236c.js.map
mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.js	zalando.de/dev/source-maps/runtime-concurrent-e8de382cfcdcc9a95fba.js.map
mosaic02.ztat.net/rnd/ng/re-runtime-chunk/index-82f7c5feedc76c0d7f3b.js	zalando.de/dev/source-maps/re-runtime-chunk/index-82f7c5feedc76c0d7f3b.js.map
mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js	zalando.de/dev/source-maps/re-common-chunk/index-252fdc6d1c203653e8bf.js.map
mosaic02.ztat.net/rnd/ng/newsletter-consent_banner/index-b07209841c1e1d46217a.js	/dev/source-maps/newsletter-consent_banner/index-b0720984...
mosaic02.ztat.net/rnd/ng/information-banner/index-d2532b8446e2e54c8baa.js	zalando.de/dev/source-maps/information-banner/index-d2532b8446e2e54c8baa.js.map
mosaic02.ztat.net/rnd/ng/header/index-5988b4452e5a672fb3e0.js	zalando.de/dev/source-maps/header/index-5988b4452e5a672fb3e0.js.map
/rnd/ng/entity_plus-exclusivity-notifications/index-0277c...	/dev/source-maps/entity_plus-exclusivity-notifications/in...
/rnd/ng/entity_body-measurement-dialog/index-7dffbcdb9eeb...	/dev/source-maps/entity_body-measurement-dialog/index-7df...
/rnd/ng/customer_shop-selector-view/index-525641936fb641c...	/dev/source-maps/customer_shop-selector-view/index-525641...
mosaic02.ztat.net/rnd/ng/chat_fashion-assistant/index-60e4e693aab9bc4beb54.js	/dev/source-maps/chat_fashion-assistant/index-60e4e693aab...
mosaic02.ztat.net/rnd/ng/app-download-banner/index-a5d839ef5d567dd4baae.js	zalando.de/dev/source-maps/app-download-banner/index-a5d839ef5d567dd4baae.js.map
mosaic02.ztat.net/rnd/ng/96343/index-01fd326a8238e3391e53.js	zalando.de/dev/source-maps/96343/index-01fd326a8238e3391e53.js.map
mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-fallback.js	mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-fallback.js.map
mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.js	mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.js.map