9.9 sec in total
261 ms
9.2 sec
443 ms
Visit bibliotheek.leidenuniv.nl now to see the best up-to-date Bibliotheek Leiden Univ content for Netherlands and also check out these interesting facts you probably never knew about bibliotheek.leidenuniv.nl
De Universitaire Bibliotheken Leiden (UBL) is een internationaal toonaangevende wetenschappelijke bibliotheek met collecties van wereldformaat en met geavanceerde diensten voor onderwijs en onderzoek....
Visit bibliotheek.leidenuniv.nlWe analyzed Bibliotheek.leidenuniv.nl page load time and found that the first response time was 261 ms and then it took 9.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.
bibliotheek.leidenuniv.nl performance score
name
value
score
weighting
Value3.3 s
39/100
10%
Value3.5 s
65/100
25%
Value19.7 s
0/100
10%
Value2,940 ms
3/100
30%
Value0.653
8/100
15%
Value27.2 s
0/100
10%
261 ms
413 ms
6585 ms
201 ms
513 ms
Our browser made a total of 26 requests to load all elements on the main page. We found that 8% of them (2 requests) were addressed to the original Bibliotheek.leidenuniv.nl, 77% (20 requests) were made to Bibliotheek.universiteitleiden.nl and 8% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (6.6 sec) relates to the external source Bibliotheek.universiteitleiden.nl.
Page size can be reduced by 18.2 kB (41%)
43.9 kB
25.8 kB
In fact, the total size of Bibliotheek.leidenuniv.nl main page is 43.9 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. 35% of websites need less resources to load. HTML takes 22.9 kB which makes up the majority of the site volume.
Potential reduce by 18.1 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 5.5 kB, which is 24% 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 18.1 kB or 79% of the original size.
Potential reduce by 50 B
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. This website has mostly compressed JavaScripts.
Number of requests can be reduced by 3 (15%)
20
17
The browser has sent 20 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bibliotheek 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 4 to 1 for JavaScripts and as a result speed up the page load time.
bibliotheek.leidenuniv.nl
261 ms
bibliotheek.leidenuniv.nl
413 ms
www.bibliotheek.universiteitleiden.nl
6585 ms
screen.css
201 ms
ul2.js
513 ms
analytics.js
291 ms
zegel.png
518 ms
banner-ubl-website-2019-01.jpg
1002 ms
get-started-homepage-website.jpg
1127 ms
bieb-toegankelijk-voor-studenten_3x1.png
1414 ms
blokje-homepage-te-zien-en-te-doen-3x1.jpg
1343 ms
lcos22-logo-rgb-copy_3x1.png
1428 ms
cds_banner_3x1.png
1236 ms
banner-nieuw.jpg
1489 ms
d50x50
1227 ms
d50x50
1342 ms
d50x50
1345 ms
world-map.png
1247 ms
collect
99 ms
vestulapro-semibold.woff
969 ms
vestulapro-regular.woff
969 ms
fontello.woff
931 ms
jquery.js
907 ms
collect
57 ms
ga-audiences
76 ms
main.js
104 ms
bibliotheek.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.
bibliotheek.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
Page has valid source maps
bibliotheek.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
Tap targets are not sized appropriately
NL
NL
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Bibliotheek.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 Bibliotheek.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.
bibliotheek.leidenuniv.nl
Open Graph description is not detected on the main page of Bibliotheek Leiden Univ. 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: