397 ms in total
67 ms
168 ms
162 ms
Visit cas.sdss.org now to see the best up-to-date Cas SDSS content for United States and also check out these interesting facts you probably never knew about cas.sdss.org
SciServer's SkyServer is for providing Sloan Digital Sky Survey (SDSS) data to the public
Visit cas.sdss.orgWe analyzed Cas.sdss.org page load time and found that the first response time was 67 ms and then it took 330 ms to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.
cas.sdss.org performance score
name
value
score
weighting
Value4.2 s
19/100
10%
Value45.6 s
0/100
25%
Value13.9 s
1/100
10%
Value0 ms
100/100
30%
Value0.065
97/100
15%
Value4.9 s
78/100
10%
67 ms
8 ms
17 ms
23 ms
13 ms
Our browser made a total of 24 requests to load all elements on the main page. We found that 8% of them (2 requests) were addressed to the original Cas.sdss.org, 92% (22 requests) were made to Skyserver.sdss.org. The less responsive or slowest element that took the longest time to load (67 ms) belongs to the original domain Cas.sdss.org.
Page size can be reduced by 88.9 kB (43%)
205.8 kB
116.9 kB
In fact, the total size of Cas.sdss.org main page is 205.8 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 152.4 kB which makes up the majority of the site volume.
Potential reduce by 22.7 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 3.1 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 22.7 kB or 85% of the original size.
Potential reduce by 45.3 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, Cas SDSS needs image optimization as it can save up to 45.3 kB or 30% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 11.7 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 11.7 kB or 75% of the original size.
Potential reduce by 9.2 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. Cas.sdss.org needs all CSS files to be minified and compressed as it can save up to 9.2 kB or 82% of the original size.
We found no issues to fix!
20
20
The browser has sent 20 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cas SDSS. According to our analytics all requests are already optimized.
cas.sdss.org
67 ms
8 ms
17 ms
home.aspx
23 ms
skyserver.css
13 ms
alerts.css
13 ms
wz_tooltip.js
11 ms
sciserver_logo_usermsg.png
20 ms
new_window_cyan.png
18 ms
sdss3_logo.gif
20 ms
flag_us.gif
18 ms
logo_sloan.jpg
19 ms
logo_nsf.jpg
23 ms
logo_energy.jpg
23 ms
sciserver_icon_bkgd_blue_64px.png
23 ms
logo_ms.jpg
27 ms
offsite.png
23 ms
new_window.png
25 ms
new_tools_1.jpg
34 ms
new_projects_1.jpg
35 ms
new_astronomy_1.jpg
33 ms
new_help_1.jpg
34 ms
new_home_bktile.jpg
33 ms
new_menu_gradient.jpg
32 ms
cas.sdss.org accessibility score
ARIA
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.
Impact
Issue
[aria-*] attributes do not match their roles
ARIA IDs are not unique
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
Links do not have a discernible name
cas.sdss.org 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
General
Impact
Issue
Detected JavaScript libraries
Page has valid source maps
cas.sdss.org SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
robots.txt is not valid
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
N/A
N/A
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cas.sdss.org can be misinterpreted by Google and other search engines. Our service has detected that English 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 Cas.sdss.org main page’s claimed encoding is . 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.
cas.sdss.org
Open Graph description is not detected on the main page of Cas SDSS. 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: