Tools & Wizards About Us
zdf.de screenshot

Report Summary

  • 48

    Performance

    Renders faster than
    67% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 54% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

zdf.de

Startseite - ZDFmediathek

Page Load Speed

7 sec in total

First Response

914 ms

Resources Loaded

2.8 sec

Page Rendered

3.2 sec

zdf.de screenshot

About Website

Visit zdf.de now to see the best up-to-date Zdf content for Germany and also check out these interesting facts you probably never knew about zdf.de

Alle Videos und Livestreams in der ZDFmediathek anschauen – ständig verfügbar und interaktiv! Entdecken Sie Filme, Serien, Sportevents, Dokumentationen und vieles mehr!

Visit zdf.de

Key Findings

We analyzed Zdf.de page load time and found that the first response time was 914 ms and then it took 6.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

zdf.de performance score

48

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.7 s

2/100

10%

LCP (Largest Contentful Paint)

Value10.2 s

0/100

25%

SI (Speed Index)

Value7.0 s

32/100

10%

TBT (Total Blocking Time)

Value180 ms

92/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value10.4 s

24/100

10%

Network Requests Diagram

www.zdf.de

914 ms

zdfCMP.js

443 ms

abGroupLibrary.js

247 ms

styles.css

472 ms

_app-polyfills.pkg.js

1075 ms

Our browser made a total of 21 requests to load all elements on the main page. We found that 86% of them (18 requests) were addressed to the original Zdf.de, 5% (1 request) were made to Cmp2.zdf.de and 5% (1 request) were made to Tag.aticdn.net. The less responsive or slowest element that took the longest time to load (1.3 sec) belongs to the original domain Zdf.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.6 MB (85%)

Content Size

3.1 MB

After Optimization

457.1 kB

  • HTML
  • Images
  • CSS

In fact, the total size of Zdf.de main page is 3.1 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 55% of websites need less resources to load. HTML takes 2.9 MB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 2.6 MB

  • Original 2.9 MB
  • After minification 2.4 MB
  • After compression 256.8 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 499.3 kB, which is 17% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 2.6 MB or 91% of the original size.

Image Optimization

-0%

Potential reduce by 0 B

  • Original 90.2 kB
  • After minification 90.2 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Zdf images are well optimized though.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 110.1 kB
  • After minification 110.1 kB
  • After compression 110.1 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Zdf.de has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 4 (44%)

Requests Now

9

After Optimization

5

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 9 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zdf. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.zdf.de

www.zdf.de

914 ms

zdfCMP.js

zdfCMP.js

443 ms

abGroupLibrary.js

abGroupLibrary.js

247 ms

styles.css

styles.css

472 ms

_app-polyfills.pkg.js

_app-polyfills.pkg.js

1075 ms

_crucial-behavior.pkg.js

_crucial-behavior.pkg.js

437 ms

_app-behavior.pkg.js

_app-behavior.pkg.js

1318 ms

piano-analytics-6.10.0.js

piano-analytics-6.10.0.js

1055 ms

off.js

off.js

102 ms

avatar@3x.png

avatar@3x.png

1246 ms

det.png

det.png

986 ms

ZDFType-Light.ttf

ZDFType-Light.ttf

1203 ms

ZDFType-ExtraLight.ttf

ZDFType-ExtraLight.ttf

1203 ms

ZDFType-Thin.ttf

ZDFType-Thin.ttf

1203 ms

ZDFType-Regular.ttf

ZDFType-Regular.ttf

1210 ms

ZDFType-Medium.ttf

ZDFType-Medium.ttf

1204 ms

ZDFType-Bold.ttf

ZDFType-Bold.ttf

1207 ms

ZDFType-SemiBold.ttf

ZDFType-SemiBold.ttf

1204 ms

ZDFType-Heavy.ttf

ZDFType-Heavy.ttf

1205 ms

ZDFType-Black.ttf

ZDFType-Black.ttf

1206 ms

zdf-iconfont.woff

zdf-iconfont.woff

1207 ms

Accessibility Review

zdf.de accessibility score

82

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

ARIA

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.

Impact

Issue

High

ARIA IDs are not unique

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.

Impact

Issue

High

Image elements do not have [alt] attributes

Best Practices

zdf.de best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

zdf.de SEO score

92

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    DE

  • Language Claimed

    DE

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zdf.de can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and it matches the claimed language. Our system also found out that Zdf.de main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

zdf.de

Open Graph data is detected on the main page of Zdf. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: