Tools & Wizards About Us
zdb-katalog.de screenshot

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

zdb-katalog.de

ZDB catalogue - Home

Page Load Speed

3.6 sec in total

First Response

479 ms

Resources Loaded

3 sec

Page Rendered

92 ms

zdb-katalog.de screenshot

About Website

Click here to check amazing ZDB Katalog content for Singapore. Otherwise, check out these important facts you probably never knew about zdb-katalog.de

ZDB Magazines Database

Visit zdb-katalog.de

Key Findings

We analyzed Zdb-katalog.de page load time and found that the first response time was 479 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

zdb-katalog.de performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.8 s

0/100

10%

LCP (Largest Contentful Paint)

Value11.0 s

0/100

25%

SI (Speed Index)

Value7.9 s

22/100

10%

TBT (Total Blocking Time)

Value210 ms

88/100

30%

CLS (Cumulative Layout Shift)

Value0.103

89/100

15%

TTI (Time to Interactive)

Value9.2 s

32/100

10%

Network Requests Diagram

zdb-katalog.de

479 ms

zdb-katalog.de

513 ms

theme.css.xhtml

133 ms

components.css.xhtml

289 ms

jquery.js.xhtml

688 ms

Our browser made a total of 37 requests to load all elements on the main page. We found that 92% of them (34 requests) were addressed to the original Zdb-katalog.de, 5% (2 requests) were made to Code.etracker.com and 3% (1 request) were made to Etracker.de. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Zdb-katalog.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 3.5 kB (1%)

Content Size

443.3 kB

After Optimization

439.8 kB

  • Images
  • JavaScript
  • CSS

In fact, the total size of Zdb-katalog.de main page is 443.3 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. 45% of websites need less resources to load. Images take 407.7 kB which makes up the majority of the site volume.

HTML Optimization

-0%

Potential reduce by -8 B

  • Original 0 B

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 web page is already compressed.

Image Optimization

-1%

Potential reduce by 2.4 kB

  • Original 407.7 kB
  • After minification 405.3 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. ZDB Katalog images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 281 B

  • Original 33.9 kB
  • After minification 33.9 kB
  • After compression 33.6 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. This website has mostly compressed JavaScripts.

CSS Optimization

-48%

Potential reduce by 834 B

  • Original 1.8 kB
  • After minification 1.8 kB
  • After compression 916 B

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. Zdb-katalog.de needs all CSS files to be minified and compressed as it can save up to 834 B or 48% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (60%)

Requests Now

30

After Optimization

12

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZDB Katalog. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 13 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zdb-katalog.de

zdb-katalog.de

479 ms

zdb-katalog.de

zdb-katalog.de

513 ms

theme.css.xhtml

theme.css.xhtml

133 ms

components.css.xhtml

components.css.xhtml

289 ms

jquery.js.xhtml

jquery.js.xhtml

688 ms

core.js.xhtml

core.js.xhtml

461 ms

components.js.xhtml

components.js.xhtml

1062 ms

jquery-plugins.js.xhtml

jquery-plugins.js.xhtml

826 ms

jsf.js.xhtml

jsf.js.xhtml

592 ms

primefaces-locale_en.js.xhtml

primefaces-locale_en.js.xhtml

403 ms

zdb.core.js.xhtml

zdb.core.js.xhtml

520 ms

opensans-woff.css

opensans-woff.css

575 ms

opensans-woff2.css

opensans-woff2.css

635 ms

main.css

main.css

697 ms

lib-bundle.js.xhtml

lib-bundle.js.xhtml

1097 ms

bundle.js.xhtml

bundle.js.xhtml

977 ms

main.min.js.xhtml

main.min.js.xhtml

801 ms

e.js

e.js

540 ms

opensans-woff.css

opensans-woff.css

115 ms

opensans-woff2.css

opensans-woff2.css

116 ms

zdb_logo_weiss.svg.xhtml

zdb_logo_weiss.svg.xhtml

182 ms

zdb_logo_ohne_text_weiss.svg.xhtml

zdb_logo_ohne_text_weiss.svg.xhtml

179 ms

load-indicator.gif

load-indicator.gif

183 ms

dnb_logo.svg.xhtml

dnb_logo.svg.xhtml

184 ms

staatsbib-preussischer-kulturbesitz.svg.xhtml

staatsbib-preussischer-kulturbesitz.svg.xhtml

180 ms

t.js

t.js

177 ms

mem8YaGs126MiZpBA-UFVZ0d.woff

mem8YaGs126MiZpBA-UFVZ0d.woff

169 ms

mem5YaGs126MiZpBA-UN7rgOUuhv.woff

mem5YaGs126MiZpBA-UN7rgOUuhv.woff

217 ms

icomoon.woff

icomoon.woff

197 ms

country

country

128 ms

dcz

dcz

121 ms

home_bild.png

home_bild.png

237 ms

bx_loader.gif

bx_loader.gif

169 ms

controls.png

controls.png

169 ms

mem6YaGs126MiZpBA-UFUK0Zdcs.woff

mem6YaGs126MiZpBA-UFUK0Zdcs.woff

205 ms

memnYaGs126MiZpBA-UFUKWiUNhrIqU.woff

memnYaGs126MiZpBA-UFUKWiUNhrIqU.woff

216 ms

cntcc

cntcc

516 ms

Accessibility Review

zdb-katalog.de accessibility score

84

Accessibility Issues

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 input fields do not have accessible names

High

[role]s do not have all required [aria-*] attributes

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.

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

The document uses <meta http-equiv="refresh">

Best Practices

zdb-katalog.de best practices score

75

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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

zdb-katalog.de SEO score

90

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

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

    EN

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zdb-katalog.de can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Zdb-katalog.de main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

zdb-katalog.de

Open Graph description is not detected on the main page of ZDB Katalog. 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: