Tools & Wizards About Us
esa.int screenshot

Report Summary

  • 56

    Performance

    Renders faster than
    72% 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
    74% 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 a poor result, as 50% 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

  • HTML
  • Images
  • JavaScript
  • CSS

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

  • AJAX
  • Images
  • JavaScript
  • CSS

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.

Network Requests Diagram

esa.int

esa.int

170 ms

esa.int

esa.int

358 ms

www.esa.int

www.esa.int

103 ms

c35b41a32fb01cc5cc5a0efcc8ca483e_1685535780_all.css

c35b41a32fb01cc5cc5a0efcc8ca483e_1685535780_all.css

31 ms

fontawesome.css

fontawesome.css

16 ms

brands.css

brands.css

29 ms

solid.css

solid.css

30 ms

jquery-2.2.4.min.js

jquery-2.2.4.min.js

47 ms

ec3756e8a47adc0f64e3c43418bca85a_1634129598.js

ec3756e8a47adc0f64e3c43418bca85a_1634129598.js

40 ms

matomo.js

matomo.js

696 ms

ESA_Menu.svg

ESA_Menu.svg

181 ms

menu_overlay.html

menu_overlay.html

181 ms

ESA_Search.svg

ESA_Search.svg

86 ms

ESA_Title.svg

ESA_Title.svg

76 ms

ESA_Logo.svg

ESA_Logo.svg

84 ms

arrow.svg

arrow.svg

74 ms

The_Sun_s_fluffy_corona_in_exquisite_detail_pillars.png

The_Sun_s_fluffy_corona_in_exquisite_detail_pillars.png

121 ms

Earth_from_Space_Namibian_landforms_pillars.jpg

Earth_from_Space_Namibian_landforms_pillars.jpg

128 ms

Ariane_6_stands_tall_for_launch_pillars.png

Ariane_6_stands_tall_for_launch_pillars.png

101 ms

Discover_ESA_Live_pillars.png

Discover_ESA_Live_pillars.png

112 ms

EarthCARE_mission_cover_card_full.jpg

EarthCARE_mission_cover_card_full.jpg

87 ms

arrow-white.svg

arrow-white.svg

89 ms

Space_awaits_you_card_medium.jpg

Space_awaits_you_card_medium.jpg

90 ms

Ariane_6_media_kit_cover_card_medium.jpg

Ariane_6_media_kit_cover_card_medium.jpg

91 ms

play-button.svg

play-button.svg

95 ms

Meet_the_team_behind_EarthCARE_card_medium.png

Meet_the_team_behind_EarthCARE_card_medium.png

103 ms

Earth_from_Space_Namibian_landforms_card_full.jpg

Earth_from_Space_Namibian_landforms_card_full.jpg

98 ms

ESA_s_solar-powered_giant_one_year_on_card_medium.jpg

ESA_s_solar-powered_giant_one_year_on_card_medium.jpg

105 ms

Checking_EarthCARE_under_UV_light_card_medium.jpg

Checking_EarthCARE_under_UV_light_card_medium.jpg

103 ms

Exolaunch_s_EXOpod_Nova._Credit_Exolaunch_card_medium.jpg

Exolaunch_s_EXOpod_Nova._Credit_Exolaunch_card_medium.jpg

106 ms

A_year_in_training_ESA_s_new_astronauts_graduate_card_medium.png

A_year_in_training_ESA_s_new_astronauts_graduate_card_medium.png

114 ms

Euclid_s_view_of_the_Horsehead_Nebula_pillars.jpg

Euclid_s_view_of_the_Horsehead_Nebula_pillars.jpg

129 ms

Our_missions_card_medium.jpg

Our_missions_card_medium.jpg

116 ms

DiscoverESA_cover_image_card_medium.png

DiscoverESA_cover_image_card_medium.png

124 ms

This_is_ESA_card_medium.jpg

This_is_ESA_card_medium.jpg

124 ms

ESA_blog_navigator_link_card_medium.jpg

ESA_blog_navigator_link_card_medium.jpg

129 ms

ESA_brand_centre_card_medium.jpg

ESA_brand_centre_card_medium.jpg

130 ms

The_Sun_in_high_resolution_pillars.jpg

The_Sun_in_high_resolution_pillars.jpg

146 ms

The_Sun_s_fluffy_corona_in_exquisite_detail_card_medium.png

The_Sun_s_fluffy_corona_in_exquisite_detail_card_medium.png

133 ms

Horsehead_Nebula_NIRCam_image_card_medium.jpg

Horsehead_Nebula_NIRCam_image_card_medium.jpg

135 ms

Exoplanet_K2-18_b_Illustration_card_medium.jpg

Exoplanet_K2-18_b_Illustration_card_medium.jpg

134 ms

Mars_Express_sees_traces_of_spiders_in_Mars_s_Inca_City_card_medium.jpg

Mars_Express_sees_traces_of_spiders_in_Mars_s_Inca_City_card_medium.jpg

137 ms

The_Sun_s_fluffy_corona_in_exquisite_detail_-_unannotated_version_card_medium.jpg

The_Sun_s_fluffy_corona_in_exquisite_detail_-_unannotated_version_card_medium.jpg

136 ms

Webb_captures_iconic_Horsehead_Nebula_in_unprecedented_detail_card_full.jpg

Webb_captures_iconic_Horsehead_Nebula_in_unprecedented_detail_card_full.jpg

143 ms

Ariane_6_stands_tall_for_launch_card_medium.png

Ariane_6_stands_tall_for_launch_card_medium.png

141 ms

Space_Team_Europe_for_Ariane_6_Julien_Guiridlian_card_medium.jpg

Space_Team_Europe_for_Ariane_6_Julien_Guiridlian_card_medium.jpg

138 ms

NotesESAbold.woff

NotesESAbold.woff

72 ms

NotesStyle.woff

NotesStyle.woff

71 ms

NotesESAregular.woff

NotesESAregular.woff

71 ms

fa-brands-400.ttf

fa-brands-400.ttf

76 ms

flexslider-icon.woff

flexslider-icon.woff

65 ms

fa-solid-900.ttf

fa-solid-900.ttf

140 ms

Careers_card_medium.jpg

Careers_card_medium.jpg

64 ms

Business_with_ESA_card_medium.jpg

Business_with_ESA_card_medium.jpg

63 ms

Open_Space_Innovation_Platform_card_medium.jpg

Open_Space_Innovation_Platform_card_medium.jpg

63 ms

ESA_Commercialisation_Gateway_card_medium.gif

ESA_Commercialisation_Gateway_card_medium.gif

162 ms

Earth_from_Space_Seychelles_card_full.png

Earth_from_Space_Seychelles_card_full.png

135 ms

First_Ariane_6_booster_gets_lift_to_launch_zone_card_full.jpg

First_Ariane_6_booster_gets_lift_to_launch_zone_card_full.jpg

131 ms

Ariane_6_standing_tall_card_full.jpg

Ariane_6_standing_tall_card_full.jpg

128 ms

Europe_seen_by_ERS_satellite_card_medium.jpg

Europe_seen_by_ERS_satellite_card_medium.jpg

124 ms

Media_card_medium.jpg

Media_card_medium.jpg

129 ms

Education_card_medium.jpg

Education_card_medium.jpg

132 ms

Kids_card_medium.jpg

Kids_card_medium.jpg

127 ms

ESA_Shop_image_card_medium.jpg

ESA_Shop_image_card_medium.jpg

122 ms

Earth_from_Space_Namibian_landforms_card_medium.jpg

Earth_from_Space_Namibian_landforms_card_medium.jpg

119 ms

flag_ger.png

flag_ger.png

116 ms

flag_aus.png

flag_aus.png

117 ms

flag_bel.png

flag_bel.png

115 ms

flag_den.png

flag_den.png

116 ms

flag_spa.png

flag_spa.png

113 ms

flag_est.png

flag_est.png

117 ms

flag_fin.png

flag_fin.png

112 ms

flag_fra.png

flag_fra.png

112 ms

flag_gre.png

flag_gre.png

111 ms

flag_hun.png

flag_hun.png

109 ms

flag_ire.png

flag_ire.png

117 ms

flag_ita.png

flag_ita.png

109 ms

flag_lux.png

flag_lux.png

117 ms

flag_nor.png

flag_nor.png

114 ms

flag_the.png

flag_the.png

115 ms

flag_pol.png

flag_pol.png

115 ms

flag_por.png

flag_por.png

114 ms

flag_cze.png

flag_cze.png

115 ms

flag_rom.png

flag_rom.png

112 ms

flag_uni.png

flag_uni.png

115 ms

flag_swe.png

flag_swe.png

111 ms

flag_swi.png

flag_swi.png

110 ms

Science_Exploration_Samantha_Cristoforetti_card_medium.png

Science_Exploration_Samantha_Cristoforetti_card_medium.png

112 ms

Science_Exploration_Alexander_Gerst_card_medium.png

Science_Exploration_Alexander_Gerst_card_medium.png

112 ms

Science_Exploration_Matthias_Maurer_card_medium.png

Science_Exploration_Matthias_Maurer_card_medium.png

106 ms

Science_Exploration_Andreas_Mogensen_card_medium.png

Science_Exploration_Andreas_Mogensen_card_medium.png

105 ms

Science_Exploration_Luca_Parmitano_card_medium.png

Science_Exploration_Luca_Parmitano_card_medium.png

105 ms

Science_Exploration_Tim_Peake_card_medium.png

Science_Exploration_Tim_Peake_card_medium.png

103 ms

Science_Exploration_Thomas_Pesquet_card_medium.png

Science_Exploration_Thomas_Pesquet_card_medium.png

103 ms

Science_Exploration_Class_of_2022_card_medium.png

Science_Exploration_Class_of_2022_card_medium.png

103 ms

Smile_spacecraft_artist_impression_card_medium.png

Smile_spacecraft_artist_impression_card_medium.png

102 ms

SOHO_reaches_5000_comets_card_full.jpg

SOHO_reaches_5000_comets_card_full.jpg

101 ms

ESA_s_Star_Mapper_visualisation_card_medium.png

ESA_s_Star_Mapper_visualisation_card_medium.png

100 ms

Hera_swings_by_Mars_card_medium.gif

Hera_swings_by_Mars_card_medium.gif

113 ms

Planetary_defenders_assemble_card_full.jpg

Planetary_defenders_assemble_card_full.jpg

100 ms

Zero_Debris_card_medium.png

Zero_Debris_card_medium.png

100 ms

ESA_satellite_returns_to_Earth_ERS-2_reentry_card_medium.jpg

ESA_satellite_returns_to_Earth_ERS-2_reentry_card_medium.jpg

99 ms

NAVISP_Industry_2023_ESTEC_card_medium.png

NAVISP_Industry_2023_ESTEC_card_medium.png

99 ms

ESA_Ph-week_2021_card_medium.jpg

ESA_Ph-week_2021_card_medium.jpg

99 ms

Exolaunch_s_EXOpod_Nova._Credit_Exolaunch_card_full.jpg

Exolaunch_s_EXOpod_Nova._Credit_Exolaunch_card_full.jpg

98 ms

OPS-SAT_reentry_amateur_radio_campaign_card_medium.png

OPS-SAT_reentry_amateur_radio_campaign_card_medium.png

98 ms

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

esa.int

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: