Tools & Wizards About Us
dhm.de screenshot

Report Summary

  • 52

    Performance

    Renders faster than
    71% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    57% of websites

  • 84

    SEO

    Google-friendlier than
    53% of websites

dhm.de

Deutsches Historisches Museum

Page Load Speed

5.1 sec in total

First Response

517 ms

Resources Loaded

4.2 sec

Page Rendered

375 ms

dhm.de screenshot

About Website

Click here to check amazing Dhm content for Germany. Otherwise, check out these important facts you probably never knew about dhm.de

Das Deutsche Historische Museum in Berlin ist Deutschlands nationales Geschichtsmuseum und eines der größten Geschichtsmuseen der Welt.

Visit dhm.de

Key Findings

We analyzed Dhm.de page load time and found that the first response time was 517 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 65% of websites can load faster.

Performance Metrics

dhm.de performance score

52

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.2 s

78/100

10%

LCP (Largest Contentful Paint)

Value7.1 s

6/100

25%

SI (Speed Index)

Value10.6 s

7/100

10%

TBT (Total Blocking Time)

Value210 ms

88/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value14.0 s

10/100

10%

Network Requests Diagram

dhm.de

517 ms

stylesheet_56978604cb.css

216 ms

stylesheet_8af1171b07.css

217 ms

reset.css

218 ms

MyFontsWebfontsKit.css

930 ms

Our browser made a total of 79 requests to load all elements on the main page. We found that 90% of them (71 requests) were addressed to the original Dhm.de, 3% (2 requests) were made to and 3% (2 requests) were made to Otile3.mqcdn.com. The less responsive or slowest element that took the longest time to load (1.9 sec) belongs to the original domain Dhm.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 820.9 kB (27%)

Content Size

3.0 MB

After Optimization

2.2 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dhm.de main page is 3.0 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. 50% of websites need less resources to load. Images take 1.7 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 41.2 kB

  • Original 48.3 kB
  • After minification 39.3 kB
  • After compression 7.1 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 9.1 kB, which is 19% 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 41.2 kB or 85% of the original size.

Image Optimization

-3%

Potential reduce by 44.2 kB

  • Original 1.7 MB
  • After minification 1.7 MB

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. Dhm images are well optimized though.

JavaScript Optimization

-72%

Potential reduce by 414.7 kB

  • Original 574.4 kB
  • After minification 504.4 kB
  • After compression 159.7 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 414.7 kB or 72% of the original size.

CSS Optimization

-50%

Potential reduce by 320.8 kB

  • Original 643.7 kB
  • After minification 606.8 kB
  • After compression 322.9 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. Dhm.de needs all CSS files to be minified and compressed as it can save up to 320.8 kB or 50% of the original size.

Requests Breakdown

Number of requests can be reduced by 44 (58%)

Requests Now

76

After Optimization

32

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dhm. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 20 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

dhm.de

dhm.de

517 ms

stylesheet_56978604cb.css

stylesheet_56978604cb.css

216 ms

stylesheet_8af1171b07.css

stylesheet_8af1171b07.css

217 ms

reset.css

reset.css

218 ms

MyFontsWebfontsKit.css

MyFontsWebfontsKit.css

930 ms

grid.css

grid.css

228 ms

colors.css

colors.css

226 ms

icons.css

icons.css

448 ms

global.css

global.css

450 ms

background.css

background.css

448 ms

jquery-1.9.1.min.js

jquery-1.9.1.min.js

568 ms

modernizr-2.6.2-respond-1.1.0.min.js

modernizr-2.6.2-respond-1.1.0.min.js

471 ms

jquery.dropkick-1.0.0.js

jquery.dropkick-1.0.0.js

656 ms

jquery.collapse.js

jquery.collapse.js

665 ms

jquery.jcarousel.min.js

jquery.jcarousel.min.js

667 ms

responsiveslides.js

responsiveslides.js

676 ms

accessible-tabs.js

accessible-tabs.js

782 ms

dhm_global.js

dhm_global.js

868 ms

cal.css

cal.css

878 ms

dhm-cal.js

dhm-cal.js

880 ms

colorbox.css

colorbox.css

892 ms

om.dhm.css

om.dhm.css

994 ms

om.osm.css

om.osm.css

1088 ms

slick.css

slick.css

1107 ms

slick-theme.css

slick-theme.css

1108 ms

piwik.js

piwik.js

543 ms

slick.js

slick.js

1156 ms

jquery.colorbox.js

jquery.colorbox.js

1159 ms

om.dhm.js

om.dhm.js

1205 ms

javascript_db63842ac7.js

javascript_db63842ac7.js

1293 ms

2d5da6

2d5da6

20 ms

index.php

index.php

557 ms

background.jpg

background.jpg

765 ms

csm_160106-2_DHM_YadVashem_Web-Slider_klein_01_df2911161f.jpg

csm_160106-2_DHM_YadVashem_Web-Slider_klein_01_df2911161f.jpg

962 ms

csm_Wappentafel_2fdf06db8f.jpg

csm_Wappentafel_2fdf06db8f.jpg

540 ms

csm_symposium_kal_e5986e97e1.jpg

csm_symposium_kal_e5986e97e1.jpg

559 ms

csm_KK_kal_04_792a4c1bab.jpg

csm_KK_kal_04_792a4c1bab.jpg

537 ms

141219_Dauerausstellung-Web_2erTeaser.jpg

141219_Dauerausstellung-Web_2erTeaser.jpg

771 ms

teaser50-depot-452x279.jpg

teaser50-depot-452x279.jpg

1056 ms

csm_footer-map_02_98c0e7401b.jpg

csm_footer-map_02_98c0e7401b.jpg

854 ms

csm_symposium_kal_4f6fbf9b2c.jpg

csm_symposium_kal_4f6fbf9b2c.jpg

968 ms

merkel.jpg

merkel.jpg

1180 ms

csm_DHM-24._10.2015._c_Siesing__8__f665a3dc42.jpg

csm_DHM-24._10.2015._c_Siesing__8__f665a3dc42.jpg

1079 ms

Filmreihen-Teas25.jpg

Filmreihen-Teas25.jpg

1066 ms

header-bildarchiv-665x280_02.jpg

header-bildarchiv-665x280_02.jpg

1270 ms

objektdatenbank_212x279_02.jpg

objektdatenbank_212x279_02.jpg

1276 ms

csm_KK_kal_03_70e96fd3fd.jpg

csm_KK_kal_03_70e96fd3fd.jpg

1363 ms

csm_YadVashem_kal_02_7285aa4b22.jpg

csm_YadVashem_kal_02_7285aa4b22.jpg

1372 ms

csm_YadVashem_kal_03_e7c1f331ad.jpg

csm_YadVashem_kal_03_e7c1f331ad.jpg

1386 ms

csm_KK_kal_06_203a7445e9.jpg

csm_KK_kal_06_203a7445e9.jpg

1485 ms

csm_KK_kal_07_f0a176ef1a.jpg

csm_KK_kal_07_f0a176ef1a.jpg

1575 ms

black-70.png

black-70.png

1349 ms

bg_mainmenu.png

bg_mainmenu.png

1446 ms

sprite.png

sprite.png

1544 ms

violett.png

violett.png

1455 ms

orange.png

orange.png

1558 ms

sprite@2x.png

sprite@2x.png

1858 ms

red.png

red.png

1647 ms

darkturquoise.png

darkturquoise.png

1657 ms

green.png

green.png

1670 ms

blue.png

blue.png

1756 ms

linkarow-dark@2x.png

linkarow-dark@2x.png

1771 ms

vPAuE=

vPAuE=

6 ms

mk2+AF1vAZA=

mk2+AF1vAZA=

4 ms

leaflet.css

leaflet.css

1448 ms

om.dhm.css

om.dhm.css

1462 ms

stylesheet_576a6cd711.css

stylesheet_576a6cd711.css

1472 ms

leaflet.js

leaflet.js

1669 ms

javascript_8833c01b7e.js

javascript_8833c01b7e.js

1570 ms

main.js

main.js

1655 ms

javascript_6b56360111.js

javascript_6b56360111.js

1659 ms

5372.png

5372.png

96 ms

5372.png

5372.png

55 ms

5373.png

5373.png

54 ms

5373.png

5373.png

49 ms

marker-icon.png

marker-icon.png

220 ms

marker-shadow.png

marker-shadow.png

224 ms

mq_logo.png

mq_logo.png

29 ms

print.css

print.css

215 ms

Accessibility Review

dhm.de accessibility score

77

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-*] attributes do not match their roles

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

[role]s are not contained by their required parent element

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

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

dhm.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

Missing source maps for large first-party JavaScript

SEO Factors

dhm.de SEO score

84

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

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

Document doesn't have a valid hreflang

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 Dhm.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 Dhm.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

dhm.de

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