4.2 sec in total
543 ms
3.3 sec
378 ms
Visit over.leidenuniv.nl now to see the best up-to-date Over Leiden Univ content for Netherlands and also check out these interesting facts you probably never knew about over.leidenuniv.nl
De Universiteit Leiden, in 1575 opgericht, is een van Europa’s meest vooraanstaande internationale onderzoeksuniversiteiten.
Visit over.leidenuniv.nlWe analyzed Over.leidenuniv.nl page load time and found that the first response time was 543 ms and then it took 3.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.
over.leidenuniv.nl performance score
name
value
score
weighting
Value3.0 s
51/100
10%
Value12.5 s
0/100
25%
Value6.1 s
45/100
10%
Value280 ms
81/100
30%
Value0.741
6/100
15%
Value14.3 s
9/100
10%
543 ms
771 ms
553 ms
390 ms
197 ms
Our browser made a total of 32 requests to load all elements on the main page. We found that 3% of them (1 request) were addressed to the original Over.leidenuniv.nl, 84% (27 requests) were made to Universiteitleiden.nl and 6% (2 requests) were made to Cdn.mathjax.org. The less responsive or slowest element that took the longest time to load (1.5 sec) relates to the external source Universiteitleiden.nl.
Page size can be reduced by 213.0 kB (68%)
312.9 kB
100.0 kB
In fact, the total size of Over.leidenuniv.nl main page is 312.9 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. 40% of websites need less resources to load. Javascripts take 281.3 kB which makes up the majority of the site volume.
Potential reduce by 25.0 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 5.4 kB, which is 17% 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 25.0 kB or 79% of the original size.
Potential reduce by 187.9 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 187.9 kB or 67% of the original size.
Number of requests can be reduced by 7 (26%)
27
20
The browser has sent 27 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Over Leiden Univ. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and as a result speed up the page load time.
over.leidenuniv.nl
543 ms
over-ons
771 ms
jquery-1.11.2.min.js
553 ms
screen.css
390 ms
picturefill.min.js
197 ms
jquery-ui-1.10.3.custom.min.js
397 ms
jquery.matchHeight-min.js
175 ms
main.js
176 ms
MathJax.js
62 ms
zegel.png
128 ms
searchborder.png
126 ms
mainnavborder.png
125 ms
d674x400
692 ms
showcase-grad.png
122 ms
d674x400
697 ms
d674x400
689 ms
d32x32
192 ms
d32x32
197 ms
d32x32
199 ms
d50x50
287 ms
d50x50
295 ms
d50x50
296 ms
internationalisering-2.jpg
1237 ms
bio-science-park-11.jpg
588 ms
academiegebouw-middel.jpg
1481 ms
world-map.png
809 ms
TeX-AMS_HTML.js
46 ms
ga.js
40 ms
vestula_semibold-webfont.woff
649 ms
vestula_regular-webfont.woff
760 ms
fontello.woff
659 ms
__utm.gif
35 ms
over.leidenuniv.nl accessibility score
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
Buttons do not have an accessible name
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
over.leidenuniv.nl best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
over.leidenuniv.nl SEO score
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
Document uses legible font sizes
NL
NL
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Over.leidenuniv.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it matches the claimed language. Our system also found out that Over.leidenuniv.nl 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.
over.leidenuniv.nl
Open Graph data is detected on the main page of Over Leiden Univ. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: