Analyze OBS De Tarthorst - Welkom op de site van OBS de Tarthorst

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Page load speed analysis

  • 62/100

    Normal result
  • 6

    Successful tests
  • 2

    Failed tests
  • First response

    480 ms

  • Resources loaded

    1.8 sec

  • Page rendered

    251 ms

  • Total page load time

    2.5 sec

Visit now to see the best up-to-date OBS De Tarthorst content and also check out these interesting facts you probably never knew about

We analyzed page load time and found that the first response time was 480 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Page optimization

  • HTML 30.9 kB
    Images 2.9 MB
    Javascripts 0 B
    CSS 15.1 kB

    In fact, the total size of 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. 65% of websites need less resources to load. Images take 2.9 MB which makes up the majority of the site volume.

    • Original 30.9 kB
    • After minification 29.4 kB
    • After compression 5.7 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 25.2 kB or 82% of the original size.

    • Original 2.9 MB
    • After optimization 2.8 MB

    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. OBS De Tarthorst images are well optimized though.

    • Original 15.1 kB
    • After minification 10.9 kB
    • After compression 2.2 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 12.9 kB or 85% of the original size.

Network requests diagram

  • buttons.css
  • global.css
  • general.css
  • newclass.css
  • txt.css
  • css
  • functions.js
  • jquerylatest.min.js
  • jquery.browserdetection.js
  • pop_events.php
  • setheight.php
  • tabfix.js
  • slideshow.min.js
  • bootstrapFixOld.css
  • global.css
  • css
  • css
  • background.jpg
  • triangles.png
  • containerTop.png
  • containerBottom.png
  • header.png
  • menu.png
  • nl.png
  • en.png
  • logo.png
  • EOS_7D_4200.JPG
  • EOS_7D_4218.JPG
  • Tarthorst07.jpg
  • Tarthorst06.jpg
  • Tarthorst05.jpg
  • EOS_7D_3376.JPG
  • EOS_7D_3370.JPG
  • gebouw.jpg
  • Logo_vreedzame_school.jpg
  • EOS_7D_4323.JPG
  • EOS_7D_4356.JPG
  • Tarthorst02.jpg
  • Tarthorst04.jpg
  • Tarthorst03.jpg
  • slideshowMask.png
  • middleBG.png
  • news+kalendar.png
  • kalendarData.png
  • footer.png
  • myblyOycMnPMGjfPG-DzPywlidHJgAgmTjOEEzwu1L8.ttf
  • myblyOycMnPMGjfPG-DzPywlidHJgAgmTjOEEzwu1L8.ttf
  • cJZKeOuBrn4kERxqtaUH3SZ2oysoEQEeKwjgmXLRnTc.ttf
  • DXI1ORHCpsQm3Vp6mXoaTZS3E-kSBmtLoNJPDtbj2Pk.ttf
  • MTP_ySUJH_bn48VBG8sNSpS3E-kSBmtLoNJPDtbj2Pk.ttf
  • k3k702ZOKiLJc3WVjuplzJS3E-kSBmtLoNJPDtbj2Pk.ttf

Our browser made a total of 52 requests to load all elements on the main page. We found that 83% of them (43 requests) were addressed to the original, 12% (6 requests) were made to and 6% (3 requests) were made to The less responsive or slowest element that took the longest time to load (735 ms) belongs to the original domain

Additional info on


The browser has sent 45 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OBS De Tarthorst. 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 from 10 to 1 for CSS 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 300
NS 300

300 Mname:
Rname: hostmaster\
Serial: 2020042205
Refresh: 10800
Retry: 3600
Expire: 604800
Minimum-ttl: 3600


Language and encoding

Poor result


NL nl 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 Dutch 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.

Normal result

Visitor World Map

The server of is located in Netherlands, but, unfortunately, we cannot identify the countries where the visitors come from and thus it’s impossible to define if the distance can potentially affect the page load time.

Good result

Normal result

Social Sharing Optimization

Open Graph data is detected on the main page of OBS De Tarthorst. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook:

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