3.7 sec in total
673 ms
2.8 sec
159 ms
Welcome to cds.u-strasbg.fr homepage info - get ready to check CDS U Strasbg best content for France right away, or after learning these important things about cds.u-strasbg.fr
The Strasbourg astronomical Data Center (CDS) is a data center dedicated to the collection and worldwide distribution of astronomical data and related information. It is located at the Strasbourg Astr...
Visit cds.u-strasbg.frWe analyzed Cds.u-strasbg.fr page load time and found that the first response time was 673 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.
cds.u-strasbg.fr performance score
name
value
score
weighting
Value1.1 s
99/100
10%
Value13.8 s
0/100
25%
Value2.5 s
98/100
10%
Value0 ms
100/100
30%
Value0.111
87/100
15%
Value1.1 s
100/100
10%
673 ms
299 ms
204 ms
204 ms
294 ms
Our browser made a total of 31 requests to load all elements on the main page. We found that 84% of them (26 requests) were addressed to the original Cds.u-strasbg.fr, 10% (3 requests) were made to Cdsannotations.u-strasbg.fr and 3% (1 request) were made to Assessment.datasealofapproval.org. The less responsive or slowest element that took the longest time to load (2.2 sec) relates to the external source Cdsweb.u-strasbg.fr.
Page size can be reduced by 238.2 kB (36%)
659.3 kB
421.1 kB
In fact, the total size of Cds.u-strasbg.fr main page is 659.3 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. 20% of websites need less resources to load. Images take 398.0 kB which makes up the majority of the site volume.
Potential reduce by 17.7 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 6.8 kB, which is 32% 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 17.7 kB or 82% of the original size.
Potential reduce by 51.5 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. Obviously, CDS U Strasbg needs image optimization as it can save up to 51.5 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 106.5 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 106.5 kB or 65% of the original size.
Potential reduce by 62.5 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. Cds.u-strasbg.fr needs all CSS files to be minified and compressed as it can save up to 62.5 kB or 83% of the original size.
Number of requests can be reduced by 6 (20%)
30
24
The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of CDS U Strasbg. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.
cds.u-strasbg.fr
673 ms
bootstrap.min.css
299 ms
cds.min.css
204 ms
cds_small.png
204 ms
cds.png
294 ms
cdsportal_icon.gif
938 ms
simbad_small.png
1686 ms
vizier_small.png
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aladin_small.png
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DSA_2014_2015.gif
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programme_40years.jpg
2160 ms
piwikinit
270 ms
piwiktracker
282 ms
jquery-1.7.1.min.js
406 ms
bootstrap.min.js
296 ms
jquery.placeholder.min.js
354 ms
cdsInit.min.js
399 ms
xmatch_icon2.png
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dic_40x35.png
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sesame_icon_42x35.png
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simplay_icon_40x35.png
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ads_80x35.gif
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aanda_90x35.png
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rss_32x32.png
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email_icon_small.png
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logo-insu.png
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logo-uds.png
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logo-WDS.png
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glyphicons-halflings-white.png
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glyphicons-halflings.png
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piwik.js
302 ms
cds.u-strasbg.fr accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
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
Links do not have a discernible name
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
cds.u-strasbg.fr best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
cds.u-strasbg.fr SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Image elements do not have [alt] attributes
Document doesn't have a valid hreflang
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cds.u-strasbg.fr 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 Cds.u-strasbg.fr 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.
cds.u-strasbg.fr
Open Graph description is not detected on the main page of CDS U Strasbg. 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: