Analyze ZEISS Deutschland, optische und opto-elektronische Technologie

ZEISS ist ein weltweit tätiger Technologiekonzern mit Lösungen für Industrie, Forschung, Medizin, Brillengläser, Fotoobjektive, Ferngläser und Planetarien.

Page load speed analysis

  • 66/100

    Normal result
  • 6

    Successful tests
  • 2

    Failed tests
  • First response

    290 ms

  • Resources loaded

    2.4 sec

  • Page rendered

    154 ms

  • Total page load time

    2.9 sec

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We analyzed page load time and found that the first response time was 290 ms and then it took 2.6 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Page optimization

  • HTML 57.8 kB
    Images 522.0 kB
    Javascripts 650.3 kB
    CSS 196.5 kB

    In fact, the total size of main page is 1.4 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. 30% of websites need less resources to load. Javascripts take 650.3 kB which makes up the majority of the site volume.

    • Original 57.8 kB
    • After minification 47.7 kB
    • After compression 9.4 kB

    HTML optimization

    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 10.1 kB, which is 18% 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 48.4 kB or 84% of the original size.

    • Original 522.0 kB
    • After optimization 493.9 kB

    Image optimization

    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. ZEISS images are well optimized though.

    • Original 650.3 kB
    • After minification 650.2 kB
    • After compression 198.1 kB

    JavaScript optimization

    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 452.2 kB or 70% of the original size.

    • Original 196.5 kB
    • After minification 194.6 kB
    • After compression 35.0 kB

    CSS optimization

    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. needs all CSS files to be minified and compressed as it can save up to 161.5 kB or 82% of the original size.

Network requests diagram

  • home.html
  • zeiss-corporate.css
  • zeiss-corporate.css2.css
  • zeiss-corporate.domino.css
  • zeiss-corporate.js
  • zeiss-corporate.js2.js
  • satelliteLib-6c587e49b31d4f59883905c2bab3b0ee1a03ebb2.js
  • analytics.js
  • zeiss.logo.png
  • language-switch-sprite.png
  • icon.lupe.png
  • menu_backbutton.png
  • astronaut-on-the-moon.jpg
  • astronaut-on-the-moon.jpg
  • press_conference.jpg
  • press_conference.jpg
  • zeiss-exolens_980x308.jpg
  • zeiss-exolens_preview.jpg
  • historical-figures-zeiss.jpg
  • zeiss_thumb.gif
  • icon.facebook.png
  • icon.twitter.png
  • icon.gplus.png
  • icon.linkedin.png
  • icon.xing.png
  • icon.pinterest.png
  • icon.kununu.png
  • linklist_internal_link.gif
  • nav.footer.png
  • 0bff5a93-ce9b-4468-9a94-431fb03301d0.woff
  • f90b67e0-ac70-41c5-9f16-d837fa32d424.woff
  • linkid.js
  • collect
  • link_black.gif
  • 5beb2de5-f02e-4d93-95f9-8dae06b289d8.woff
  • 19bacc54-51c0-4c56-9535-b754d5b775c8.woff
  • stage.level.indicator.png
  • white-opacity-30.png
  • back-to-top.png
  • collect

Our browser made a total of 43 requests to load all elements on the main page. We found that 88% of them (38 requests) were addressed to the original, 9% (4 requests) were made to and 2% (1 request) were made to The less responsive or slowest element that took the longest time to load (766 ms) belongs to the original domain

Additional info on


The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZEISS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.









Possible request optimization











Normal result


As for redirects, our browser reached this domain in two steps. The first redirect led to, then it was forwarded to, and finally we managed to open this domain. We strongly recommend that the redirects should be reduced, as the more redirects a site has, the slower it loads.

IP address uses IP addresses which are currently shared with 7 other domains. The more sites share the same stack of IP addresses, the higher the host server’s workload is. It is strongly recommended that the host server should be changed or the hosting provider should be requested to give a different (separate) IP address for this domain.

Normal result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 3600
NS 3600
NS 3600

3600 Mname: dnsserverh2
Serial: 2018062883
Refresh: 10800
Retry: 3600
Expire: 604800
Minimum-ttl: 600
MX 3600 Pri: 10

Language and encoding

Good result


DE de language flag


DE de language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

Country of origin for 93.3% of all visits is Germany. It lies approximately 3650 miles away from the server location (United States) and such a long distance can negatively affect website speed, as it takes some time for data to travel back and forth between those places. That’s why one of the best ways to speed up page load time for the majority of users is moving the server to Germany or just closer to the user base.

Poor result

Poor result

Social Sharing Optimization

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

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