Access nelos.azurewebsites.net. Nederlandstalige Liga voor Onderwateronderzoek en -Sport

name

value

score

weighting

FCP (First Contentful Paint)

Value14.4 s

0/100

10%

LCP (Largest Contentful Paint)

Value34.9 s

0/100

25%

SI (Speed Index)

Value17.9 s

0/100

10%

TBT (Total Blocking Time)

Value1,700 ms

11/100

30%

CLS (Cumulative Layout Shift)

Value1.619

0/100

15%

TTI (Time to Interactive)

Value34.3 s

0/100

10%

nelos.azurewebsites.net

1227 ms

LogOn

229 ms

Nelos.css

184 ms

jquery.ui.all.css

244 ms

jquery-1.6.4.min.js

947 ms

Our browser made a total of 29 requests to load all elements on the main page. We found that all of those requests were addressed to Nelos.azurewebsites.net and no external sources were called. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Nelos.azurewebsites.net.

Content Size

52.5 kB

After Optimization

6.8 kB

In fact, the total size of Nelos.azurewebsites.net main page is 52.5 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. CSS take 49.5 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 2.2 kB

Original 3.0 kB
After minification 2.5 kB
After compression 825 B

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 473 B, which is 16% 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 2.2 kB or 73% of the original size.

CSS Optimization

-88%

Potential reduce by 43.5 kB

Original 49.5 kB
After minification 25.8 kB
After compression 6.0 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. Nelos.azurewebsites.net needs all CSS files to be minified and compressed as it can save up to 43.5 kB or 88% of the original size.

Requests Now

After Optimization

The browser has sent 24 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nelos Azurewebsites. 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 from 15 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

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.

High

ARIA IDs are not unique

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

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.

High

Image elements do not have [alt] attributes

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

NL
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Nelos.azurewebsites.net can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Nelos.azurewebsites.net 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.

Social Sharing Optimization

Open Graph description is not detected on the main page of Nelos Azurewebsites. 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: