Report Summary

  • 91

    Performance

    Renders faster than
    91% of other websites

  • 67

    Accessibility

    Visual factors better than
    that of 32% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 50

    SEO

    Google-friendlier than
    18% of websites

astro.ulb.ac.be

Institut d'Astronomie et d'Astrophysique : Main - Home Page browse

Page Load Speed

3.6 sec in total

First Response

588 ms

Resources Loaded

2.4 sec

Page Rendered

573 ms

astro.ulb.ac.be screenshot

About Website

Visit astro.ulb.ac.be now to see the best up-to-date Astro Ulb content for Belgium and also check out these interesting facts you probably never knew about astro.ulb.ac.be

Visit astro.ulb.ac.be

Key Findings

We analyzed Astro.ulb.ac.be page load time and found that the first response time was 588 ms and then it took 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.

Performance Metrics

astro.ulb.ac.be performance score

91

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

62/100

10%

LCP (Largest Contentful Paint)

Value2.6 s

87/100

25%

SI (Speed Index)

Value4.1 s

79/100

10%

TBT (Total Blocking Time)

Value10 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.007

100/100

15%

TTI (Time to Interactive)

Value2.7 s

97/100

10%

Network Requests Diagram

astro.ulb.ac.be

588 ms

LaTeXMathML.js

514 ms

jquery.min.js

33 ms

galleria-1.2.5.min.js

592 ms

not2simple.css

501 ms

Our browser made a total of 20 requests to load all elements on the main page. We found that 95% of them (19 requests) were addressed to the original Astro.ulb.ac.be, 5% (1 request) were made to Ajax.googleapis.com. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Astro.ulb.ac.be.

Page Optimization Overview & Recommendations

Page size can be reduced by 14.1 kB (76%)

Content Size

18.6 kB

After Optimization

4.5 kB

In fact, the total size of Astro.ulb.ac.be main page is 18.6 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. 25% of websites need less resources to load. HTML takes 18.6 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 14.1 kB

  • Original 18.6 kB
  • After minification 16.5 kB
  • After compression 4.5 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 2.1 kB, which is 12% 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 14.1 kB or 76% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (16%)

Requests Now

19

After Optimization

16

The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Astro Ulb. 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.

Accessibility Review

astro.ulb.ac.be accessibility score

67

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

astro.ulb.ac.be best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

astro.ulb.ac.be SEO score

50

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Astro.ulb.ac.be can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Astro.ulb.ac.be main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of Astro Ulb. 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: