3.6 sec in total
266 ms
3 sec
311 ms
Click here to check amazing Leidenarchief content. Otherwise, check out these important facts you probably never knew about leidenarchief.nl
Erfgoed Leiden en Omstreken is hét cultuurhistorisch centrum voor gemeente Leiden en de regio. Hier werken archivisten, bouw- en architectuurhistorici, archeologen, en molenaars als erfgoedprofessiona...
Visit leidenarchief.nlWe analyzed Leidenarchief.nl page load time and found that the first response time was 266 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.
leidenarchief.nl performance score
name
value
score
weighting
Value4.3 s
17/100
10%
Value7.7 s
3/100
25%
Value6.9 s
33/100
10%
Value850 ms
34/100
30%
Value0
100/100
15%
Value9.3 s
32/100
10%
266 ms
256 ms
507 ms
171 ms
254 ms
Our browser made a total of 60 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Leidenarchief.nl, 87% (52 requests) were made to Erfgoedleiden.nl and 5% (3 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (1.2 sec) relates to the external source Erfgoedleiden.nl.
Page size can be reduced by 883.4 kB (33%)
2.7 MB
1.8 MB
In fact, the total size of Leidenarchief.nl main page is 2.7 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. 45% of websites need less resources to load. Images take 1.6 MB which makes up the majority of the site volume.
Potential reduce by 28.6 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. 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 28.6 kB or 80% of the original size.
Potential reduce by 18.8 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. Leidenarchief images are well optimized though.
Potential reduce by 486.8 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 486.8 kB or 69% of the original size.
Potential reduce by 349.1 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. Leidenarchief.nl needs all CSS files to be minified and compressed as it can save up to 349.1 kB or 94% of the original size.
Number of requests can be reduced by 36 (67%)
54
18
The browser has sent 54 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Leidenarchief. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.
leidenarchief.nl
266 ms
www.erfgoedleiden.nl
256 ms
www.erfgoedleiden.nl
507 ms
mootools-core.js
171 ms
core.js
254 ms
mootools-more.js
555 ms
modal.js
296 ms
jquery.min.js
454 ms
jquery-noconflict.js
319 ms
jquery-migrate.min.js
316 ms
caption.js
335 ms
css
66 ms
screen.css
474 ms
screen2.css
502 ms
modal.css
411 ms
mod_lei_searchform_collections.js
417 ms
jquery.min.js
696 ms
jquery-ui.min.js
41 ms
foundation.min.js
695 ms
jquery.cookie.js
544 ms
jquery.bxslider.patched.js
693 ms
monuments.js
694 ms
lei_mootools.js
748 ms
lei_jquery.js
749 ms
logo-leiden-en-omstreken.png
226 ms
menu.png
226 ms
search-white.png
227 ms
serach-options.png
225 ms
info.png
225 ms
geraedtsgroot.jpg
505 ms
handleiding_header.jpg
1188 ms
Haarlemmerstraateendjegroot.jpg
537 ms
webexposities-middel.jpg
457 ms
schatkamer.png
240 ms
arrow.png
240 ms
bouwen3-middel.jpg
503 ms
bouwen.png
318 ms
archiefzorg1-klein.jpg
589 ms
archiefzorg.png
546 ms
collecties-01.jpg
585 ms
collecties.png
594 ms
search-grey.png
624 ms
educatie2-middel.jpg
726 ms
educatie.png
666 ms
onderzoek-middel.jpg
769 ms
werkgebied3-klein.jpg
778 ms
werkgebied.png
712 ms
organisatie2-klein.jpg
750 ms
organisatie.png
800 ms
molen1-groot.jpg
906 ms
molen.png
834 ms
kaart.png
859 ms
v0SdcGFAl2aezM9Vq_aFTQ.ttf
160 ms
nj47mAZe0mYUIySgfn0wpQ.ttf
176 ms
DvlFBScY1r-FMtZSYIYoYw.ttf
184 ms
analytics.js
158 ms
bx_loader.gif
659 ms
prev-next.png
676 ms
collect
11 ms
print.css
88 ms
leidenarchief.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
<frame> or <iframe> elements do not have a title
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
leidenarchief.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
leidenarchief.nl SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
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 Leidenarchief.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 Leidenarchief.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.
leidenarchief.nl
Open Graph description is not detected on the main page of Leidenarchief. 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: