5.6 sec in total
637 ms
4.7 sec
279 ms
Visit nat.vu.nl now to see the best up-to-date Nat Vu content for Netherlands and also check out these interesting facts you probably never knew about nat.vu.nl
The Department of Physics and Astronomy is world leading in research and teaching of physics at the interface of life- and medical/health sciences. Important topics include the study of photosynthesis...
Visit nat.vu.nlWe analyzed Nat.vu.nl page load time and found that the first response time was 637 ms and then it took 5 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.
nat.vu.nl performance score
name
value
score
weighting
Value3.0 s
50/100
10%
Value12.1 s
0/100
25%
Value7.6 s
25/100
10%
Value2,290 ms
5/100
30%
Value0
100/100
15%
Value9.9 s
27/100
10%
637 ms
379 ms
656 ms
23 ms
735 ms
Our browser made a total of 34 requests to load all elements on the main page. We found that 85% of them (29 requests) were addressed to the original Nat.vu.nl, 6% (2 requests) were made to Google-analytics.com and 6% (2 requests) were made to Vu.nl. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Nat.vu.nl.
Page size can be reduced by 171.7 kB (13%)
1.3 MB
1.1 MB
In fact, the total size of Nat.vu.nl main page is 1.3 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. 25% of websites need less resources to load. Images take 1.2 MB which makes up the majority of the site volume.
Potential reduce by 39.2 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 13.1 kB, which is 28% 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 39.2 kB or 82% of the original size.
Potential reduce by 100.7 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. Nat Vu images are well optimized though.
Potential reduce by 28.2 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 28.2 kB or 49% of the original size.
Potential reduce by 3.6 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. Nat.vu.nl needs all CSS files to be minified and compressed as it can save up to 3.6 kB or 77% of the original size.
Number of requests can be reduced by 16 (52%)
31
15
The browser has sent 31 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nat Vu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.
nat.vu.nl
637 ms
index.aspx
379 ms
static
656 ms
ga.js
23 ms
theme_nat
735 ms
jquery.cycle.all.min.js
383 ms
ga-searchengines.js
428 ms
ga-links.js
474 ms
colorbox.css
357 ms
jquery.colorbox-min.js
345 ms
body_bg.png
259 ms
Zwaartekrachtsgolven_tcm208-751399.png
385 ms
Banner-PhysicsMaster_tcm208-267496.jpg
374 ms
footer_vua_en_tcm208-14398.gif
342 ms
defaultsprite.png
676 ms
restyle_intranet_arrow.gif
481 ms
logo_tcm208-72379.png
588 ms
general_menu_separator.gif
622 ms
topic_physics_groot_tcm208-244794.jpg
1066 ms
arrow2.gif
623 ms
accordion_down_1.png
719 ms
accordion_down_2.png
869 ms
accordion_down_3.png
851 ms
Zd2E9abXLFGSr9G3YK2MsFzqCfRpIA3W6ypxnPISCPA.woff
191 ms
__utm.gif
119 ms
border3.png
729 ms
border4.png
706 ms
loading.gif
818 ms
cookie-bar-bg.png
943 ms
topic_life_groot_tcm208-244797.jpg
1504 ms
topic_energy_groot_tcm208-244800.jpg
1293 ms
topic_light_groot_tcm208-244804.jpg
2144 ms
topic_astro_groot_tcm208-244802.jpg
1373 ms
print.css
261 ms
nat.vu.nl accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
[aria-*] attributes do not match their roles
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
Image elements do not have [alt] attributes
nat.vu.nl best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Missing source maps for large first-party JavaScript
nat.vu.nl SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
Image elements do not have [alt] attributes
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
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Nat.vu.nl 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 Nat.vu.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.
nat.vu.nl
Open Graph description is not detected on the main page of Nat Vu. 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: