Tools & Wizards About Us
d-nb.de screenshot

Report Summary

  • 14

    Performance

    Renders faster than
    26% of other websites

  • 92

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 93

    SEO

    Google-friendlier than
    84% of websites

d-nb.de

DNB - Startseite

Page Load Speed

5.4 sec in total

First Response

334 ms

Resources Loaded

4.9 sec

Page Rendered

132 ms

d-nb.de screenshot

About Website

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

Die Deutsche Nationalbibliothek ist die zentrale Archivbibliothek Deutschlands.

Visit d-nb.de

Key Findings

We analyzed D-nb.de page load time and found that the first response time was 334 ms and then it took 5.1 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

d-nb.de performance score

14

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.5 s

2/100

10%

LCP (Largest Contentful Paint)

Value25.2 s

0/100

25%

SI (Speed Index)

Value11.6 s

5/100

10%

TBT (Total Blocking Time)

Value1,910 ms

8/100

30%

CLS (Cumulative Layout Shift)

Value0.153

75/100

15%

TTI (Time to Interactive)

Value26.0 s

0/100

10%

Network Requests Diagram

d-nb.de

334 ms

www.d-nb.de

1473 ms

home_node.html

210 ms

libs.min.js

1133 ms

projekktor.js

1023 ms

Our browser made a total of 31 requests to load all elements on the main page. We found that 6% of them (2 requests) were addressed to the original D-nb.de, 74% (23 requests) were made to Dnb.de and 13% (4 requests) were made to Etracker.de. The less responsive or slowest element that took the longest time to load (1.5 sec) belongs to the original domain D-nb.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.0 MB (65%)

Content Size

1.6 MB

After Optimization

556.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of D-nb.de main page is 1.6 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. 25% of websites need less resources to load. Javascripts take 1.3 MB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 21.4 kB

  • Original 28.8 kB
  • After minification 26.3 kB
  • After compression 7.4 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 21.4 kB or 74% of the original size.

Image Optimization

-7%

Potential reduce by 18.5 kB

  • Original 255.4 kB
  • After minification 237.0 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. DNB images are well optimized though.

JavaScript Optimization

-76%

Potential reduce by 953.5 kB

  • Original 1.3 MB
  • After minification 997.8 kB
  • After compression 309.0 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 953.5 kB or 76% of the original size.

CSS Optimization

-87%

Potential reduce by 22.7 kB

  • Original 26.1 kB
  • After minification 13.1 kB
  • After compression 3.4 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. D-nb.de needs all CSS files to be minified and compressed as it can save up to 22.7 kB or 87% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (43%)

Requests Now

28

After Optimization

16

  • Images
  • JavaScript
  • CSS

The browser has sent 28 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DNB. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

d-nb.de

d-nb.de

334 ms

www.d-nb.de

www.d-nb.de

1473 ms

home_node.html

home_node.html

210 ms

libs.min.js

libs.min.js

1133 ms

projekktor.js

projekktor.js

1023 ms

projekktor.css

projekktor.css

316 ms

visual.css

visual.css

209 ms

screen.css

screen.css

410 ms

JQuery.js

JQuery.js

510 ms

e.js

e.js

234 ms

Init.js

Init.js

563 ms

header_print.png

header_print.png

106 ms

logo-1.gif

logo-1.gif

107 ms

header_haeuser.gif

header_haeuser.gif

104 ms

bahnriss.jpg

bahnriss.jpg

110 ms

more_link_img.gif

more_link_img.gif

104 ms

coverAlvinRoth.jpg

coverAlvinRoth.jpg

216 ms

icon_link.gif

icon_link.gif

206 ms

luminale2016.jpg

luminale2016.jpg

312 ms

icon_external_link.png

icon_external_link.png

208 ms

buchmesseLeipzig2016.jpg

buchmesseLeipzig2016.jpg

523 ms

icon_info.gif

icon_info.gif

213 ms

banner_fuss.gif

banner_fuss.gif

308 ms

Facebook.png

Facebook.png

316 ms

Twitter.png

Twitter.png

319 ms

jquery-1.8.3.min.js

jquery-1.8.3.min.js

395 ms

269 ms

t.js

t.js

299 ms

cnt_js.php

cnt_js.php

262 ms

cntcc

cntcc

266 ms

print.css

print.css

208 ms

Accessibility Review

d-nb.de accessibility score

92

Accessibility Issues

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

d-nb.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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

d-nb.de SEO score

93

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

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 D-nb.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 D-nb.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

d-nb.de

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