2.8 sec in total
710 ms
1.9 sec
199 ms
Click here to check amazing Library Leiden content for Netherlands. Otherwise, check out these important facts you probably never knew about library.leiden.edu
Leiden University Libraries (UBL) is an internationally recognised research library with world-class collections and advanced services for education and research. The UBL provides these scholarly info...
Visit library.leiden.eduWe analyzed Library.leiden.edu page load time and found that the first response time was 710 ms and then it took 2.1 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.
library.leiden.edu performance score
name
value
score
weighting
Value3.2 s
44/100
10%
Value4.1 s
47/100
25%
Value10.1 s
9/100
10%
Value500 ms
58/100
30%
Value0.523
15/100
15%
Value17.1 s
4/100
10%
710 ms
480 ms
589 ms
481 ms
200 ms
Our browser made a total of 28 requests to load all elements on the main page. We found that 14% of them (4 requests) were addressed to the original Library.leiden.edu, 68% (19 requests) were made to Live.leiden.edu and 11% (3 requests) were made to Beeldbank.leidenuniv.nl. The less responsive or slowest element that took the longest time to load (710 ms) belongs to the original domain Library.leiden.edu.
Page size can be reduced by 35.2 kB (24%)
148.0 kB
112.8 kB
In fact, the total size of Library.leiden.edu main page is 148.0 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. 15% of websites need less resources to load. Images take 89.3 kB which makes up the majority of the site volume.
Potential reduce by 8.4 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 1.9 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 8.4 kB or 73% of the original size.
Potential reduce by 2.9 kB
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. Library Leiden images are well optimized though.
Potential reduce by 34 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.
Potential reduce by 23.9 kB
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. Library.leiden.edu needs all CSS files to be minified and compressed as it can save up to 23.9 kB or 80% of the original size.
Number of requests can be reduced by 12 (52%)
23
11
The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Library Leiden. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.
library.leiden.edu
710 ms
nbl.min.js
480 ms
main.css
589 ms
jquery-1.8.3.min.js
481 ms
rendition.js
200 ms
ga.js
27 ms
ul_logo.png
89 ms
bnbig_default.jpg
639 ms
ul_logo_print.png
174 ms
file_rss.png
202 ms
crumb_chevron.png
101 ms
bkg_main.png
182 ms
bkg_btn.png
176 ms
bkg_middle.png
183 ms
arrow_right.png
184 ms
arrow_midsec.png
199 ms
biblio_start.png
263 ms
biblio_question.png
280 ms
arrow_sidebar.png
274 ms
icon-facebook.png
274 ms
icon-twitter.png
297 ms
icon-youtube.png
349 ms
crumb_overlay.png
376 ms
plugins.js
97 ms
4
197 ms
4
181 ms
4
195 ms
print.css
98 ms
library.leiden.edu 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.
library.leiden.edu 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
library.leiden.edu 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
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Library.leiden.edu can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Library.leiden.edu 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.
library.leiden.edu
Open Graph description is not detected on the main page of Library Leiden. 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: