Report Summary

  • 56

    Performance

    Renders faster than
    73% of other websites

  • 62

    Accessibility

    Visual factors better than
    that of 28% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

esa.int

European Space Agency

Page Load Speed

2.6 sec in total

First Response

170 ms

Resources Loaded

1.4 sec

Page Rendered

1 sec

esa.int screenshot

About Website

Click here to check amazing Esa content for China. Otherwise, check out these important facts you probably never knew about esa.int

The European Space Agency portal features the latest news in space exploration, human spaceflight, launchers, telecommunications, navigation, monitoring and space science.

Visit esa.int

Key Findings

We analyzed Esa.int page load time and found that the first response time was 170 ms and then it took 2.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

esa.int performance score

56

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value3.8 s

54/100

25%

SI (Speed Index)

Value11.1 s

5/100

10%

TBT (Total Blocking Time)

Value280 ms

81/100

30%

CLS (Cumulative Layout Shift)

Value0.015

100/100

15%

TTI (Time to Interactive)

Value29.0 s

0/100

10%

Network Requests Diagram

esa.int

170 ms

esa.int

358 ms

www.esa.int

103 ms

c35b41a32fb01cc5cc5a0efcc8ca483e_1685535780_all.css

31 ms

fontawesome.css

16 ms

Our browser made a total of 106 requests to load all elements on the main page. We found that 98% of them (104 requests) were addressed to the original Esa.int, 1% (1 request) were made to Code.jquery.com and 1% (1 request) were made to Www-analytics.esa.int. The less responsive or slowest element that took the longest time to load (696 ms) relates to the external source Www-analytics.esa.int.

Page Optimization Overview & Recommendations

Page size can be reduced by 715.1 kB (5%)

Content Size

14.9 MB

After Optimization

14.2 MB

In fact, the total size of Esa.int main page is 14.9 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. Only a small number of websites need less resources to load. Images take 14.4 MB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 113.5 kB

  • Original 128.9 kB
  • After minification 102.7 kB
  • After compression 15.4 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 26.2 kB, which is 20% 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 113.5 kB or 88% of the original size.

Image Optimization

-3%

Potential reduce by 408.0 kB

  • Original 14.4 MB
  • After minification 14.0 MB

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. Esa images are well optimized though.

JavaScript Optimization

-6%

Potential reduce by 4.0 kB

  • Original 61.4 kB
  • After minification 61.4 kB
  • After compression 57.4 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. This website has mostly compressed JavaScripts.

CSS Optimization

-77%

Potential reduce by 189.6 kB

  • Original 247.5 kB
  • After minification 206.3 kB
  • After compression 57.9 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. Esa.int needs all CSS files to be minified and compressed as it can save up to 189.6 kB or 77% of the original size.

Requests Breakdown

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

Requests Now

97

After Optimization

94

The browser has sent 97 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Esa. 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 CSS and as a result speed up the page load time.

Accessibility Review

esa.int accessibility score

62

Accessibility Issues

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

Buttons do not have an accessible name

High

Links do not have a discernible name

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

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

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

esa.int best practices score

83

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

SEO Factors

esa.int SEO score

92

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

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

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Esa.int 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 Esa.int 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 data is detected on the main page of Esa. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: