Tools & Wizards About Us
ptb.de screenshot

Report Summary

  • 54

    Performance

    Renders faster than
    71% of other websites

  • 97

    Accessibility

    Visual factors better than
    that of 92% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

ptb.de

Physikalisch-Technische Bundesanstalt

Page Load Speed

6.2 sec in total

First Response

314 ms

Resources Loaded

5.6 sec

Page Rendered

321 ms

ptb.de screenshot

About Website

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

Die Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, ist das nationale Metrologie-Institut mit wissenschaftlich-technischen Dienstleistungsaufgaben. Sie misst mit höchster Genauig...

Visit ptb.de

Key Findings

We analyzed Ptb.de page load time and found that the first response time was 314 ms and then it took 5.9 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

ptb.de performance score

54

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.0 s

3/100

10%

LCP (Largest Contentful Paint)

Value6.1 s

12/100

25%

SI (Speed Index)

Value8.9 s

15/100

10%

TBT (Total Blocking Time)

Value80 ms

99/100

30%

CLS (Cumulative Layout Shift)

Value0.017

100/100

15%

TTI (Time to Interactive)

Value7.9 s

43/100

10%

Network Requests Diagram

ptb.de

314 ms

ptb.de

446 ms

www.ptb.de

443 ms

501 ms

news-basic.css

350 ms

Our browser made a total of 64 requests to load all elements on the main page. We found that 98% of them (63 requests) were addressed to the original Ptb.de, 2% (1 request) were made to Uhr.ptb.de. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Ptb.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 134.8 kB (21%)

Content Size

637.9 kB

After Optimization

503.1 kB

  • HTML
  • Images

In fact, the total size of Ptb.de main page is 637.9 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 507.8 kB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 113.2 kB

  • Original 130.1 kB
  • After minification 101.5 kB
  • After compression 16.9 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 28.7 kB, which is 22% 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 113.2 kB or 87% of the original size.

Image Optimization

-4%

Potential reduce by 21.6 kB

  • Original 507.8 kB
  • After minification 486.1 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. Ptb images are well optimized though.

Requests Breakdown

Number of requests can be reduced by 41 (68%)

Requests Now

60

After Optimization

19

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 60 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ptb. 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 16 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

ptb.de

ptb.de

314 ms

ptb.de

ptb.de

446 ms

www.ptb.de

www.ptb.de

443 ms

501 ms

news-basic.css

news-basic.css

350 ms

stylesheet_a8576f538a.css

stylesheet_a8576f538a.css

351 ms

main.css

main.css

372 ms

basics.css

basics.css

452 ms

publications.css

publications.css

356 ms

calendar.css

calendar.css

369 ms

cssstyletypo3.css

cssstyletypo3.css

1246 ms

extensions.css

extensions.css

1619 ms

homepage.css

homepage.css

1260 ms

jquery-3.6.0.min.js

jquery-3.6.0.min.js

2072 ms

jquery-migrate-1.4.1.min.js

jquery-migrate-1.4.1.min.js

1183 ms

shopdisplaytitel.js

shopdisplaytitel.js

803 ms

jquery.mousewheel.min.js

jquery.mousewheel.min.js

929 ms

gateway.js

gateway.js

1057 ms

overviewnav.js

overviewnav.js

1183 ms

html5shiv.js

html5shiv.js

1313 ms

html5shiv-printshiv.js

html5shiv-printshiv.js

1310 ms

MediaMatcher.min.js

MediaMatcher.min.js

1371 ms

ausklapper.js

ausklapper.js

1387 ms

publications.js

publications.js

1437 ms

Calendar.js

Calendar.js

1437 ms

jquery.tablesorter.min.js

jquery.tablesorter.min.js

1600 ms

javascript_9a38f34785.js

javascript_9a38f34785.js

1514 ms

news.js

news.js

1465 ms

uhr.js

uhr.js

553 ms

expertnews.js

expertnews.js

1465 ms

desktop.css

desktop.css

127 ms

desktop.js

desktop.js

146 ms

homepage.gif

homepage.gif

129 ms

logo_ptb.png

logo_ptb.png

129 ms

kontrast_grau.png

kontrast_grau.png

137 ms

gebaerdensprache_grau.png

gebaerdensprache_grau.png

136 ms

leichte-sprache_grau.png

leichte-sprache_grau.png

129 ms

search.png

search.png

129 ms

Banner_Genau_2.jpg

Banner_Genau_2.jpg

647 ms

header_element.png

header_element.png

351 ms

ar-r-small-blue.gif

ar-r-small-blue.gif

247 ms

csm_Sonnensimulator_4bdf43c84b.jpg

csm_Sonnensimulator_4bdf43c84b.jpg

337 ms

csm_Woche-der-Umwelt-quadrat_ddcccd0c1a.jpg

csm_Woche-der-Umwelt-quadrat_ddcccd0c1a.jpg

344 ms

csm_Thorium-Montage_PTB_581b5b5c8f.jpg

csm_Thorium-Montage_PTB_581b5b5c8f.jpg

239 ms

csm_Reisestart_in_Berlin_6671851a1a.jpg

csm_Reisestart_in_Berlin_6671851a1a.jpg

352 ms

ar-l.gif

ar-l.gif

373 ms

ar-r.gif

ar-r.gif

462 ms

csm_Doppelfoto_16d44a13ec.jpg

csm_Doppelfoto_16d44a13ec.jpg

456 ms

ar-t.gif

ar-t.gif

469 ms

ar-b.gif

ar-b.gif

479 ms

ptb_willkommen.gif

ptb_willkommen.gif

596 ms

internal_link.gif

internal_link.gif

586 ms

download.gif

download.gif

586 ms

csm_Dienstleistungkatalog-Icon320_1f0f517018.jpg

csm_Dienstleistungkatalog-Icon320_1f0f517018.jpg

578 ms

csm_bmwk_logo_de_2a2c2501e7.png

csm_bmwk_logo_de_2a2c2501e7.png

590 ms

nc.html

nc.html

953 ms

schaufenster.html

schaufenster.html

781 ms

event-legend.gif

event-legend.gif

125 ms

print.css

print.css

126 ms

mobile.css

mobile.css

126 ms

x-small.css

x-small.css

127 ms

small.css

small.css

125 ms

medium.css

medium.css

125 ms

large.css

large.css

127 ms

Accessibility Review

ptb.de accessibility score

97

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.

Best Practices

ptb.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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

ptb.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

robots.txt is not valid

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 Ptb.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 Ptb.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

ptb.de

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