Tools & Wizards About Us
zenner.de screenshot

Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 57% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

zenner.de

Willkommen bei ZENNER - ZENNER

Page Load Speed

4.8 sec in total

First Response

263 ms

Resources Loaded

4.3 sec

Page Rendered

289 ms

zenner.de screenshot

About Website

Welcome to zenner.de homepage info - get ready to check ZENNER best content for Germany right away, or after learning these important things about zenner.de

Mit ZENNER nutzen Sie das ganze Potenzial der Digitalisierung. Wir kombinieren smarte Messtechnik und Sensorik mit zukunftsfähigen Technologien wie dem Internet der Dinge (IoT).

Visit zenner.de

Key Findings

We analyzed Zenner.de page load time and found that the first response time was 263 ms and then it took 4.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

zenner.de performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.3 s

17/100

10%

LCP (Largest Contentful Paint)

Value4.7 s

33/100

25%

SI (Speed Index)

Value6.4 s

40/100

10%

TBT (Total Blocking Time)

Value3,750 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.01

100/100

15%

TTI (Time to Interactive)

Value12.2 s

15/100

10%

Network Requests Diagram

zenner.de

263 ms

www.zenner.de

470 ms

dropdown.css

243 ms

default.css

243 ms

4f752309b587.css

361 ms

Our browser made a total of 49 requests to load all elements on the main page. We found that 92% of them (45 requests) were addressed to the original Zenner.de, 4% (2 requests) were made to Google-analytics.com and 2% (1 request) were made to Code.etracker.com. The less responsive or slowest element that took the longest time to load (2.8 sec) belongs to the original domain Zenner.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 303.9 kB (35%)

Content Size

874.2 kB

After Optimization

570.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zenner.de main page is 874.2 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. Images take 513.6 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 40.0 kB

  • Original 51.2 kB
  • After minification 49.9 kB
  • After compression 11.2 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 40.0 kB or 78% of the original size.

Image Optimization

-9%

Potential reduce by 44.6 kB

  • Original 513.6 kB
  • After minification 469.0 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. ZENNER images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 179.6 kB

  • Original 261.8 kB
  • After minification 257.9 kB
  • After compression 82.3 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 179.6 kB or 69% of the original size.

CSS Optimization

-83%

Potential reduce by 39.8 kB

  • Original 47.7 kB
  • After minification 43.2 kB
  • After compression 7.9 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. Zenner.de needs all CSS files to be minified and compressed as it can save up to 39.8 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 17 (36%)

Requests Now

47

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 47 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZENNER. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zenner.de

zenner.de

263 ms

www.zenner.de

www.zenner.de

470 ms

dropdown.css

dropdown.css

243 ms

default.css

default.css

243 ms

4f752309b587.css

4f752309b587.css

361 ms

e53a815ab435.js

e53a815ab435.js

722 ms

Mooquee1.1.js

Mooquee1.1.js

248 ms

subcols.css

subcols.css

248 ms

subcolsIEHacks.css

subcolsIEHacks.css

365 ms

mediabox.js

mediabox.js

253 ms

bodyBG.png

bodyBG.png

135 ms

headerBG.png

headerBG.png

407 ms

logo.png

logo.png

250 ms

navLvl2HeaderBG.png

navLvl2HeaderBG.png

141 ms

navLvl3BG.png

navLvl3BG.png

136 ms

suchenBtn.png

suchenBtn.png

134 ms

ansprechpartnerBtn.png

ansprechpartnerBtn.png

256 ms

titel_trinkwv.jpg

titel_trinkwv.jpg

376 ms

youtube_160px.gif

youtube_160px.gif

263 ms

leer.gif

leer.gif

262 ms

quad.gif

quad.gif

370 ms

teaser_service_gesetze.jpg

teaser_service_gesetze.jpg

378 ms

teaser_service_nacheichung-7e9096b2.jpg

teaser_service_nacheichung-7e9096b2.jpg

384 ms

teaser_zenner_karriere-0e6f6f6a.jpg

teaser_zenner_karriere-0e6f6f6a.jpg

384 ms

bild_teaser_magazin-05b92fe9.jpg

bild_teaser_magazin-05b92fe9.jpg

515 ms

teaser_startseite_downloads-b54d0216.jpg

teaser_startseite_downloads-b54d0216.jpg

516 ms

weltkarte_6.gif

weltkarte_6.gif

622 ms

print.gif

print.gif

516 ms

pdf.gif

pdf.gif

517 ms

facebook.gif

facebook.gif

530 ms

twitter.gif

twitter.gif

611 ms

agfw.gif

agfw.gif

620 ms

dvgw.gif

dvgw.gif

1068 ms

figawa.gif

figawa.gif

771 ms

oms.gif

oms.gif

641 ms

verlauf1.png

verlauf1.png

717 ms

rightBoxH1Tile.png

rightBoxH1Tile.png

864 ms

teaser_imf_DE.jpg

teaser_imf_DE.jpg

1076 ms

teaser_rauchmelder.jpg

teaser_rauchmelder.jpg

893 ms

teaser_messkapseln.jpg

teaser_messkapseln.jpg

2835 ms

teaser_C5_cmf_V2.jpg

teaser_C5_cmf_V2.jpg

2049 ms

teaser_gsm.jpg

teaser_gsm.jpg

1222 ms

boxBG344.png

boxBG344.png

1001 ms

t.js

t.js

424 ms

fcnt_js.php

fcnt_js.php

271 ms

analytics.js

analytics.js

32 ms

cron.txt

cron.txt

672 ms

transparenz.png

transparenz.png

682 ms

collect

collect

38 ms

Accessibility Review

zenner.de accessibility score

84

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.

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

High

Links do not have a discernible name

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

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

zenner.de best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

zenner.de SEO score

79

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

High

robots.txt is not valid

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

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 Zenner.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 Zenner.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

zenner.de

Open Graph description is not detected on the main page of ZENNER. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: