Analyze Lehrer-Online: Arbeitsblätter, Unterrichtsmaterial, Entwürfe

20.000 qualitätsgesicherte Unterrichtsmaterialien für Lehrer und Referendare: Stundenverlauf, Methodenvorschlag, Arbeitsblätter zum Download.

Page load speed analysis

  • 62/100

    Normal result
  • 4

    Successful tests
  • 4

    Failed tests
  • First response

    439 ms

  • Resources loaded

    3.4 sec

  • Page rendered

    166 ms

  • Total page load time

    4 sec

Welcome to homepage info - get ready to check Lehrer Online best content for Germany right away, or after learning these important things about

We analyzed page load time and found that the first response time was 439 ms and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Page optimization

  • HTML 28.0 kB
    Images 439.3 kB
    Javascripts 242.7 kB
    CSS 43.5 kB

    In fact, the total size of main page is 753.4 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. 30% of websites need less resources to load. Images take 439.3 kB which makes up the majority of the site volume.

    • Original 28.0 kB
    • After minification 27.9 kB
    • After compression 6.1 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. 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 21.8 kB or 78% of the original size.

    • Original 439.3 kB
    • After optimization 394.3 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. Lehrer Online images are well optimized though.

    • Original 242.7 kB
    • After minification 242.6 kB
    • After compression 83.4 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 159.3 kB or 66% of the original size.

    • Original 43.5 kB
    • After minification 38.1 kB
    • After compression 7.4 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 36.0 kB or 83% of the original size.

Network requests diagram

  • lehrer-online.php
  • main.css
  • gecko.css
  • lo.css
  • main.js
  • swfobject.js
  • adscript.php
  • adscript.php
  • hg_lehrer_online.jpg
  • logo_lehrer_online.jpg
  • toplogin_btLogin.gif
  • toplogin_linkarrow.gif
  • toplogin_suche.gif
  • menu_lehrer_online.jpg
  • headrightline.gif
  • headrightlightgrey.gif
  • arrowbehind.gif
  • ne_89-986236-1.jpg
  • listarrow.gif
  • logo_lug_89-841640-1.jpg
  • banner_200x94_89-990543-1.gif
  • losleser_logo_200x47_89-1001884-1.jpg
  • bne_89-927667-1.jpg
  • lo-recht_2012_47_89-825610-1.jpg
  • headrightgrey.gif
  • icon_redaktion.gif
  • icon_newsletter.gif
  • icon_rss.gif
  • icon_werbung.gif
  • inklusion2_start_100-1105255-1.png
  • ich_180_100-1105256-1.png
  • arrowinlink.gif
  • fluchtursachen_180_100-1104970-1.png
  • icon_inlink.gif
  • automatenwirtschaft_start_100-1105109-1.png
  • nl_180_100-1004906-1.png
  • icon_exlink.gif
  • arrowrss.gif
  • nl_47_100-637999-1.gif
  • banner_200x140_100-1095432-1.png
  • ccbeilo_47_100-1036130-1.png
  • icon_delicious.gif
  • icon_yahoo.gif
  • icon_google.gif
  • piwik.js
  • icon_digg.gif
  • icon_wong.gif
  • icon_oneview.gif
  • footer_bg.gif
  • arrowmerkliste.gif
  • arrowempfehlen.gif
  • arrowdrucken.gif
  • arrowseitenanfang.gif

Our browser made a total of 53 requests to load all elements on the main page. We found that 94% of them (50 requests) were addressed to the original, 4% (2 requests) were made to and 2% (1 request) were made to The less responsive or slowest element that took the longest time to load (1.7 sec) belongs to the original domain

Additional info on


The browser has sent 52 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lehrer Online. 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

IP address uses IP address which is currently shared with 4 other domains. The more sites share the same IP address, 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.

Poor result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 300
NS 3600
NS 3600
NS 3600
NS 3600

Language and encoding

Poor result


DE de language flag


N/A  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 neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that 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.

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.

Poor result

Visitor World Map

Country of origin for 62.5% of all visits is Germany. It’s good for that their server is also located in Germany, as that enables the majority of their visitors to benefit from a much faster page load time.

Good result

Poor result

Social Sharing Optimization

Open Graph description is not detected on the main page of Lehrer Online. 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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