Duden.de Duden | Startseite
duden.de Mobile Performance
28/100
These metrics represent real-world Chrome users experience viewing duden.de on mobile devices. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Cumulative Layout Shift
Largest Contentful Paint
First Contentful Paint
First Input Delay
Metrics
Speed Index7/100 10.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint10/100 6.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive14/100 12.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint27/100 5.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Total Blocking Time52/100 580 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift100/100 0.002
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (15)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Enable text compression
Potential savings of 125 KiB
990 ms
Remove unused JavaScript
Potential savings of 161 KiB
960 ms
Defer offscreen images
Potential savings of 210 KiB
960 ms
Eliminate render-blocking resources
Potential savings of 780 ms
780 ms
Reduce initial server response time
Root document took 890 ms
290 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Minimize main-thread work
4.1 s
Serve static assets with an efficient cache policy
6 resources found
Avoid an excessive DOM size
862 elements
Reduce JavaScript execution time
1.4 s
Keep request counts low and transfer sizes small
138 requests • 1,378 KiB
Avoid chaining critical requests
53 chains found
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
18 long tasks found
Avoid large layout shifts
2 elements found
Passed Audits (14)
Minify JavaScript
Potential savings of 7 KiB
Properly size images
Avoids enormous network payloads
Total size was 1,378 KiB
Minify CSS
Remove unused CSS
Preconnect to required origins
Use video formats for animated content
Preload key requests
Minimize third-party usage
Third-party code blocked the main thread for 200 ms
All text remains visible during webfont loads
Efficiently encode images
Avoids `document.write()`
Serve images in next-gen formats
Uses passive listeners to improve scrolling performance
duden.de Mobile SEO
86/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (2)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Document does not have a meta description
Passed Audits (12)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
robots.txt is valid
Document has a `<title>` element
Image elements have `[alt]` attributes
Page isn’t blocked from indexing
Document uses legible font sizes
100% legible text
Document avoids plugins
Tap targets are sized appropriately
100% appropriately sized tap targets
Links have descriptive text
Page has successful HTTP status code
Document has a valid `hreflang`
Document has a valid `rel=canonical`
duden.de Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of duden.de mobile page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (3)
General
Browser errors were logged to the console
Trust and Safety
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
Passed Audits (11)
Detected JavaScript libraries
Page has the HTML doctype
Properly defines charset
Avoids deprecated APIs
Allows users to paste into password fields
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids Application Cache
Displays images with correct aspect ratio
Avoids requesting the notification permission on page load
Serves images with appropriate resolution
Avoids requesting the geolocation permission on page load
duden.de Mobile Progressive Web App
25/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (9)
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 12.8 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Installable
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Passed Audits (5)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
Content is sized correctly for the viewport
Provides a valid `apple-touch-icon`
Redirects HTTP traffic to HTTPS
duden.de Mobile Accessibility
0/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (4)
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors have a sufficient contrast ratio
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Form elements do not have associated labels
Links do not have a discernible name
`<frame>` or `<iframe>` elements do not have a title
Passed Audits (25)
`[id]` attributes on active, focusable elements are unique
`[role]`s are contained by their required parent element
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[lang]` attributes have a valid value
`[role]` values are valid
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Heading elements appear in a sequentially-descending order
`[aria-*]` attributes match their roles
`[aria-*]` attributes are valid and not misspelled
Document has a `<title>` element
Image elements have `[alt]` attributes
`[aria-hidden="true"]` elements do not contain focusable descendents
Definition list items are wrapped in `<dl>` elements
`<html>` element has a valid value for its `[lang]` attribute
No element has a `[tabindex]` value greater than 0
`[aria-hidden="true"]` is not present on the document `<body>`
ARIA IDs are unique
Buttons have an accessible name
`[aria-*]` attributes have valid values
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
The page contains a heading, skip link, or landmark region
`[role]`s have all required `[aria-*]` attributes
`<html>` element has a `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Mobile Usability
99/100
These checks validate how easily a visitor can use duden.de on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
60/100
These checks analyze the performance of duden.de on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (6)
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Enable compression
Minify JavaScript
Optimize images
Passed Audits (4)
Reduce server response time
Minify CSS
Minify HTML
Prioritize visible content
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